Planning Board tours tunnel

November 4th, 2011

The Montgomery County Planning Board toured the Bethesda Tunnel and the Interim CCT connection to the Rock Creek Trail yesterday to examine CCT cost issues. MTA and Montgomery County DOT and M-NCPPC staff briefed them on costs of rebuilding the CCT with the Purple Line.

Route of the Nov. 3 Planning Board tour at Bethesda
Source: Tour agenda and MTA CCT cost report (a pdf file)

Several dozen neighborhood residents also turned out for the tour, many carrying “Save the Trail” placards. Katherine Shaver was there to report for the Washington Post. Planning Board Chair Francoise Carrier reminded those present that the purpose of the tour was for the Planning Board to ask questions of the Purple Line planners. She invited the public to present comments at the Nov. 17 Planning Board work session.

Planning Board Chair Francoise Carrier addresses the public.

I’ve already posted that is important we not get tunnel vision and put too much focus on the Bethesda Tunnel while losing sight of the bigger picture for the whole trail. But I was on the Bethesda part of the tour, and would like to offer comments on several issues at the Bethesda Tunnel of interest to trail users. I’m not advocating hard for any one idea yet – I’m still trying to get a clearer picture on what the realistic choices are to make both the Purple Line and the CCT work well here:

1) Cost to put CCT over the Purple Line through the tunnel.

MTA Purple Line project manager Mike Madden stated that much of the cost and risk to dig to lower the Purple Line below the current grade, necessary to fit a trail overhead, is associated with stabilizing 35 beams that support the Apex Building. He also said that even if the Purple Line is built at the current grade without the CCT, there still will be some beams near the west end of the tunnel that will require stabilizing. MTA does not know yet how many beams would still require stabilizing even if they do not dig.

The cost of building the trail over the Purple Line in the tunnel is estimated to be 43% of the total estimated $103M trail cost. (Source: Tour agenda and MTA CCT cost report.) But that cost includes the cost of stabilizing all of the 35 beams. We need to subtract the cost of stabilizing the beams that must be done even if we do not dig, from the cost of stabilizing all 35 beams if we do dig, to know the stabilization cost that is due to the CCT.

Adjusting the cost to reflect the cost difference for stabilizing the beams will bring the CCT cost estimate down a little. And the fact that MTA does not yet know how many beams must be stabilized if we do not dig suggests they have not done enough exploration yet to have a firm cost estimate. We should have better information before we make decisions based on cost.

2) Fitting a pedestrain trail alongside the Purple Line.

WashCycle raised the question in recent blog post comments whether it might be possible to have a narrow trail alongside the Purple Line in the tunnel, without digging. The tunnel under the Apex building west of Wisconsin Ave. is wide enough to permit this – plans already call for pedestrian access from the west tunnel portal to the Purple Line platform and Metro elevators near the middle of the tunnel. But the tunnel under the Air Rights building at the east end is narrower, only 32′ wide from wall to wall. Recent Purple Line profile drawings show two light-rail tracks have a typical 29′ wide profile. But these profiles are for unconstrained spaces where the Purple Line runs at speed. It may be acceptible to reduce the separation distances between tracks and between the tracks and the side structures (i.e. poles to support the catenary wires) in the tunnel where vehicle speeds will be very low – perhaps to achieve a profile as little as 24′ wide which would leave room for an 8′ wide path in a 32′ wide total space. But you would need to be able to use all of the tunnel width from wall to wall, with no setbacks from below-grade foundation structures.

I raised this issue with MTA engineers at the Nov. 2 Open House at the National 4-H Education Center in Chevy Chase. They had not considered this yet, but agreed it should be looked at seriously. They had two concerns that might wreck the idea: 1) The tunnel width under the Wisconsin Avenue bridge might be less than it is under the Air Rights Building, and 2) The tunnel has a curve, which will require a wider spacing between tracks to allow for the transit vehicle “overhang” on the curve.

During the Nov. 3 tour we saw the tunnel under the Wisconsin Avenue bridge. Slopes down from the bridge abutment structures on both sides of the tunnel do indeed pinch the tunnel to be narrower than under the Air Rights Building. But Mike Madden explained that these were only dirt slopes, covered with concrete for erosion control. The abutment structures that support the bridge are set well back. The slopes can be cut back, and retaining walls can be used for the erosion control without disturbing any bridge structures. This could make the tunnel wider under the Wisconsin Avenue Bridge than under the Air Rights Building.

It was apparent during the walk through that the curvature of the tunnel under the Air Rights Building was only at the west side of the building and very slight. It appears likely that any allowance required for vehicle “overhang” at the curve would be slight. Mike Madden also stated that the walls of the Air Rights Building tunnel were structurally stable and extended deep enough so that they would not need to be modified, even if digging was needed.

Profile of Purple Line with CCT under the Air Rights Building
Source: Tour agenda and MTA CCT cost report (a pdf file)

It therefore appears to be very feasible to have a 6-8′ wide walking trail east through the tunnel from the Purple Line platform and Metro elevators to the east end tunnel portal, if the decision is made to not carry the CCT through the tunnel over the top of the Purple Line. The profile above shows the Purple Line with the CCT overhead. But if the CCT supporting structures are absent, the light-rail tracks can be shifted to be closer together and close to the south wall. A 6-8′ wide walking path could be on the north side. The walking path would only need to be several feet higher and separated from transit by a low fence in order to feel safe near transit, given the low speeds of the transit vehicles approaching the station platform.

Purple Line supporters should join trail users to advocate for this path, in the event the CCT is removed from the tunnel. This passageway would provide important pedestrian access between the Purple Line platform and the neighborhoods, businesses and schools east of Wisconsin Avenue. The Purple Line should carry the cost of building it since the Purple Line needs this access path.

3) Single-track Purple Line in the tunnel.

CCCT Chair Ron Tripp put the idea before the CCCT Board at the October board meeting that we should propose that the Purple Line be single-track in the Bethesda Tunnel. This would allow a full width CCT to share the tunnel with the Purple Line without any digging. I’m not a fan of this idea, but it does have enough merit to be taken seriously. The CCCT has not settled on its recommedations to address the Bethesda Tunnel cost issues yet, but single-track may be on the list.

Councilmember Berliner proposed a much longer single-track section for the Purple Line several years ago. His proposal was to single-track a 3500′ long section from the Bethesda Tunnel to the west side of the Columbia Country Club. The principal goal was to minimize the impacts on the trees and adjacent homeowners where the r.o.w. is only 66′ wide and where room to buffer the neighborhood is more limited than elsewhere on the r.o.w.

MTA studied Berliner’s single-track proposal and issued a MTA single track study (a pdf) with strong recommendations against the idea. MTA found that being able to operate only one vehicle between the Country Club and the Bethesda Station at a time would unacceptibly constrain the headway, to be at least 7 minutes. The minimum necessary headway needed to carry the heavy use in this section is believed to be 6 minutes or less. MTA was also concerned that since transit vehicles would have to leave the Bethesda station immediately, schedule problems that develop could not be corrected and would ripple through the whole system. MTA was also concerned that having only one track at Bethesda would prevent them from holding a back-up vehicle there to fill gaps in service. And finally MTA found that few trees would actually be saved during construction. Based on these findings, the County Council reluctantly dropped the idea.

The proposal to go to single-track only in the Bethesda Tunnel would result in an approx. 1500′ length of single-track, vs. the 3500′ length of Councilmember Berliner’s earlier proposal. I roughly guess that this shorter distance would take at least 1 minute off the time it would take a train to traverse the single-track section in each direction. That would mean a headway of less than 5 minutes might be possible – meeting the requirement for a 6 minute headway or shorter. That’s good. But I suspect the same issues about trains being required to leave the Bethesda Station immediately and not being able to store a back-up vehicle there would remain.

Single-track at a station, especially an end-of-line station, is a departure from what we usually see where single-track has been attempted. The parent of the Purple Line concept, the single-track Georgetown Branch Trolley, was actually planned to be double-track at all five stations along the line between Silver Spring and Bethesda, including at the Bethesda Station in the tunnel. The plan was to have trains pass at the station platforms. The stations were planned to be roughly equally spaced, at distances that would enable trains to pass at the stations and still maintain 6 minute headways. A key to making it all work was that the Georgetown Branch Trolley was to be a “closed” system that would never run on-street, so it would be possible to keep trains precisely spaced at about equal intervals. Keeping to carefully spaced intervals at all times is not considered to be feasible for the Purple Line because the Purple Line is an open system, that will run in streets and have traffic lights in parts of its route east of Silver Spring. These potential traffic interferences can introduce too much variation in train intervals for them to pass only at the stations without forcing trains to wait. Variation in train intervals is best corrected at the end-of-line stations, but the needed corrections may not be possible at a single-track end-of-line station.

Single tracking only at the Bethesda Station may be judged to create unacceptible problems for efficient transit operations. But this proposal to single-track a very short section has enough difference from Councilmember Berliner’s earlier proposal for a much longer section to merit a serious look from people who understand transit operations much better than I.

4) Safety of the Trail.

This is not a design idea, but an observation about irrational, and potentially damaging, assertions being made by some about safety of the trail in the tunnel.

Comments were heard during the Planning Board tour from the “Save the Trail” people that if the trail is elevated and placed in a confined space over the Purple Line, with no way to get off except at the ends, and without being able to see to the other end of the tunnel before entering, then the trail would be too dangerous and no one would want to use it. Ajay Bhatt, President of Friends of the Capital Crescent Trail, is quoted by Katherine Shaver in the Washington Post as saying:

“I can’t imagine people would enjoy that trail experience,” Bhatt said of an enclosed trail above trains, and “it seems like it will be a safety hazard” by attracting crime.

The problem with taking this position is that the existing trail looks like this now:

The trail we have in the tunnel now.

The existing trail is in a confined space, with no way to get off except at the ends, and without being able to see to the end of the tunnel before entering. So exactly how does Ajay Bhatt think that just elevating the trail by about 10′ will suddenly transform a trail he claims to badly want to save into a trail that is such a safety hazard that he cannot imagine anyone wanting to use it?

The danger in this “Save the Trail” position is that we are asking the Planning Board and County Council to spend many millions of dollars to keep the trail in the tunnel. If we raise groundless fears that a trail in the tunnel cannot be made safe and attractive, in a misplaced effort to make the Purple Line look bad, we seriously undercut our request to public officials to spend scarce money to keep the trail in the tunnel.

The second half of the Planning Board tour at Bethesda was along the proposed alternate street route for the CCT. Several ideas came up for discussion about how to put this route on steroids if the CCT is removed from the tunnel. But I’ve already written too much for one post, the alternate route will be the subject of a future post.

Tunnel vision

November 1st, 2011

Cross posted with edits at Greater Greater Washington

I’m sorry to be late to join the discussion about the bad news CCT costs along future Purple Line rise. There is a serious threat that the trail may be removed from the Bethesda Tunnel to reduce cost. WashCycle has opened the discussion with a good analysis of the major issues. The Montgomery County Planning Board is seriously considering removing the trail from the tunnel and several other cost reduction measures, and will be taking a walking tour of the trail to gather backbround information on Nov. 3. The M-NCPPC Capital Crescent Tour document (a pdf file) describes the walking tour agenda, and presents the detailed MTA CCT cost analysis report.

No testimony will be taken during the Nov. 3 Planning Board walking tour. The Planning Board will take the CCT cost issues up again at its Nov. 17 work session, and public testimony is expected to be taken then. Trail and cycling advocates need to sort through the cost issues and be ready to present thoughtful and convincing arguments by Nov. 17.

The early response from “Save the Trail” advocates has been a knee jerk reaction that the CCT will be destroyed if trail users are forced to use the alternative alignment that crosses Wisconsin Avenue at-grade.

Two alternative CCT routes at the Bethesda Tunnel
(source: Planning Board CCT tour agenda

I support doing everything within reason to keep the CCT in the Bethesda Tunnel, because every at-grade crossing of a busy highway takes some of the safety and convenience away from the trail that makes it so special. I made the case for keeping the trail in the tunnel when the estimated cost was $60M in a Dec. 2010 post. With the cost now approaching $100M, the case becomes harder to make and the tunnel route for the CCT is at risk.

Trail supporters have a difficult decisions to make about how to best go about fighting to keep the CCT in the Bethesda Tunnel. But making the Bethesda Tunnel our paramount issue and declaring ourselves to be opposed to the Purple Line to “Save the Trail” would be to have severe “tunnel vision”. The map, below, has been presented often in prior posts but is worth showing again .

The completed CCT will link two large urban centers and will connect to the Metropolitan Branch Trail to complete a major regional trail system.
(partial Capital Crescent Trail map from: www.cctrail.org)

If our goal is to have a regional trail, then we must remember that there is an approx. 1.5 mile long section at Silver Spring that is incomplete, and remains on-road. There are seven at-grade crossings of streets at traffic lights on the existing Georgetown Branch Trail east of the Bethesda Tunnel, including three crossings of multi-lane state highways (Connecticut Avenue, 16th Street, and Colesville Road). The rebuilt trail alongside the Purple Line would replace all 1.5 miles of on-road route with a completely off-road trail into downtown Silver Spring. All seven at-grade crossings at lights would be replaced by grade-separated crossings. Prospects for ever completing the trail and removing these seven at-grade crossings east of Bethesda are very poor without the Purple Line.

Losing the Bethesda Tunnel would be a significant loss for the CCT. We need to fight to save it. But the CCT will be more continuous and safer when rebuilt alongside the Purple Line than it is today, even if we lose the Bethesda Tunnel. Killing the Purple Line would harm the future trail much more than it would help it.

Keeping it in balance at Lyttonsville

October 6th, 2011

The MTA returned to Lyttonsville for a neighborhood meeting on Oct. 3, to follow-up on questions raised during the Sept. 13 Lyttonsville neighborhood work group meeting. As reported in the Gazette at Silver Spring residents question Purple Line redesign, some local residents remain very unhappy about the MTA proposal to “flip” the CCT to the north side of the project and to move the maintenance facility to the east side of Lyttonsville Place. Residents expressed strong views that this proposed change was a major “supersizing” of the storage yards and maintenance facility from anything that they had been shown before, and many felt the neighborhood had been blindsided at the Sept. 13 meeting with this major change. The two major concerns of local residents about the future CCT appear to be that the proposed flip would cause the loss of shade along the trail and would make access to the trail more difficult.

I saw little at this second meeting that would change my first assessment of the new plans for the CCT at Lyttonsville. I feel that the Lyttonsville Civic Association representatives and neighbors are greatly overstating the significance of the changes the MTA is proposing. The CCT can work well in this area with the new proposed alignment, provided proper attention is given to several key design issues. In particular, the new proposal should be tweeked to keep more green buffer along the trail and to improve the local access routes.

Warning: This is a long post. If you would rather not get into the neighborhood issues, then skip down to the discussion of the CCT green buffer and local access issues.

The scope and size: Not greatly increased from before.

Numerous speakers at the meeting complained bitterly that the MTA was greatly expanding the scope of the project at Lyttonsville with little prior notice. Claims were made that this was the first time MTA had shown that the project would take all of the area between the Georgetown Branch Trail corridor and Brookville Road. It was even asserted by one speaker that the plans for double tracking and running transit vehicles on headways as short as 6 minutes in the Lyttonsville area were new. These assertions, though certainly heartfelt, simply do not line up well with the public record. MTA has posted links to the presentation material for the two meetings on its website at Lyttonsville station area work group. The MTA presentation given at this second meeting addressed the history of the project, and is available as a pdf file at Oct. 3, 2011 MTA Presentation.

One can find from the history that the transit alignment was described clearly as being double tracked at Lyttonsville, and running as frequently as 6 minute headways, as early as 1990. (See, for example, the pdf file 1990 Georgetown Branch Master Plan, p. 44, for specification of double tracking along the northern side of Lyttonsville neighborhood.) The maintenance facility has grown considerably from that shown in the 1990 plan, but it was shown nearly three years ago, in this sketch presented at the Nov. 2008 public hearing, that the maintenance facility would require taking many of the businesses on the south side of Brookville Road from Lyttonsville Place to Stewart Avenue:


Lyttonsville Station as presented at the Nov. 2008 Public Hearing
(source: Oct. 3, 2011 MTA Presentation)

The Oct. 3 MTA Presentation also showed drawings that had been presented to the community in Feb. and Oct. of 2009 where all of the businesses on Brookville Road to Stewart Ave. would be impacted except one (the Counter Intelligence showroom) at the Stewart Avenue corner. Claims being made by the neighborhood that the project suddenly grew dramatically with the plan shown at the September 13 meeting don’t hold up.

Neighborhood disturbance: Little worse than what is there now.

The changes from that earlier LPA plan and the new plan do not much change the total scale, but they do change relative positions substantially. Those changes are:
1) The location of the trail, Purple Line tracks, and storage tracks are flipped, mostly with little change to the overall project footprint, to put the trail and Purple Line tracks on the north side of the project further from the Lyttonsville neighborhood.
2) The maintenance building is moved to be east of the Lyttonsville Place Bridge and closer to the Claridge House.
3) A 200 car, two level parking garage is new to the project, to be built south of the maintenance building, and
4) Stewart Avenue will be realigned with a new bridge over the Purple Line, bringing the project closer to the homes at the end of Albert Stewart Lane.

The MTA pdf file Design Option Roll Map shows the location of these features. MTA also presented the following sketch to show relative locations at the Claridge House:


The maintenance building and parking garage near the Claridge House
(Click on the image for a larger view.)

The MTA presentation makes several important points about the impacts of these changes on the neighborhood:
1) The noisiest and most active part of the system is the main Purple Line tracks and station, and they have been moved to be substantially farther from the Lyttonsville neighborhood.
2) The maintenance building is expected to be relatively quiet since work is performed inside. The storage tracks may be noisier with activity from shuttling vehicles back and forth. Switching the maintenance building location with the storage track location can help reduce the noise near the Claridge House from the prior plan.
3) The new configuration allows through movements on the storage tracks, which should reduce the amount of shuttling needed to access the vehicles.

Many residents at the meeting appeared to be very skeptical of the MTA claims that the new configuration would not seriously degrade their neighborhood. But I think an obvious fact was largely ignored by the neighbors during the discussion – that while the Lyttonsville residential area is very attractive, the area between the north side of the residences and Brookville Road is a noisy dump, and could hardly be made worse by the Purple Line. One only needs to walk around the area and listen to realize this is true. I especially encourage those who think they already know the area to do this. People who live in an area quickly become deaf to the constant noises that are in the background, and need to consciously listen to experience it as it really is.

I offer the following two Google Map views as a poor substitute for a walking tour:


View Larger Map
Behind the Claridge House, where the two level
parking garage is planned.

On my two most recent visits to the area above, a heavy front-end loader was busy moving materials in the landscaping yard near the Claridge House swimming pool. The engine noise and backing signal noise it was generating easily exceeded anything that would come from a light-rail vehicle.


View Larger Map
Looking toward the back yards of homes on
Albert Stewart Lane from Stewart Avenue

I regularly see a forklift noisily working in the Serra Stone staging yard immediately behind the homes seen in the view above. Stewart Avenue serves dozens of businesses, and there are nearly 200 parking spaces and vehicle loading spaces associated with those businesses. This draws considerable heavy truck and delivery vehicle traffic in addition to the automobile traffic. I am not convinced that removing the Serra Stone yard for the Stewart Avenue realignment, and adding automobile traffic from 200 Purple Line employees coming to the new parking garage, will have a heavy impact on the homes in this area compared to what is there now.

Shade on the CCT: Little difference from the prior plan, a green buffer should be added to either plan.

Several neighbors commented at the Oct. 3 meeting that the new Purple Line plan left the CCT with no shade through the Lyttonsville Station area. The trail would be adjacent to Brookville Road, and the MTA plan shows no green buffer at all between the trail and either Brookville Road on one side and the Purple Line tracks on the other side.

This is a big issue, but it is not a new problem that results from the “flip” from the previous plan. Close inspection of the previous plan, shown in the pdf file LPA Roll Map, reveals that the previous plan also left the CCT without shade through this area. The future CCT is pushed south from the current location of the Interim Trail, pushing into the industrial yards and eliminating the thin line of trees there now. The CCT would be left with no buffer from the treeless industrial yards. This issue must be addressed, regardless of whether the plan is flipped or not.

Trail supporters need to press MTA and other decision makers to provide some green space alongside the CCT in this area to preserve the trail experience. The Impact Comparison map suggests how this can be done:


MTA Impact Comparison map
(Click on the image for the full map.)

The map above shows the areas as shaded in green where the proposed “flip” would reduce the impact from the previous plan. There is considerable green area on the south side of the Purple Line project adjacent to the WSSC facility, west of Lyttonsville Place. I propose that area be reclaimed for the project, to expand the total width of the project to enable the storage tracks and Purple Line tracks to be shifted south by 10-15′. This shift would create space for a 10-15′ wide planted buffer along the CCT at the north side.

Expanding the project on the east side of Lyttonsville Place to also create room for a planted buffer there will have more impact on the properties along the south side, but nonetheless this should be seriously considered. The new “flip” plan has moved the Purple Line tracks farther from the Lyttonsville neighborhood than before – we can move the tracks 10-15′ south and still have the main line tracks be farther from the neighborhood than in the prior plan. In my view having the mass of tracks and trail be softened by adding a green strip with trees beside the trail would more than compensate the view from the neighborhood for having a slightly wider total project. And the experience for both the trail user and transit user will be greatly improved with small trees and green space alongside.

This is important – we need to get more green space into the design, and we can do so if we make it a priority.

Local CCT access: Give attention to the four bridges.

Residents of Lyttonsville are understandably concerned that moving the CCT to be alongside Brookville Road will make access to the CCT more difficult for them. But there is a trade-off here, since those working at the Army Walter Reed Annex and the businesses in the industrial park will find it easier to reach the CCT. If the MTA goes forward with the new plan, the design should incorporate upgrades to all four bridges crossing over the Purple Line so that Lyttonsville residents have the best local access to the trail possible under the circumstances.

At Grubb Road: The MTA drawing for the new plan shows that access to the trail from Grubb Road/Terrace Drive to the CCT will be by a new pedestrian bridge over the Purple Line where the access trail to the Interim Trail is now. But the plan also shows a long switchback ramp on the south side of the Purple Line to gain the elevation needed for the bridge to clear the Purple Line. I believe this switchback is not needed, and that a cursory inspection of the area by MTA will confirm that little more is needed here than a short ramp.

The old Brookville Pike crossed over the B&O Railroad tracks at this location for many years. The crossing is shown in the 1918 Right-of-Way and Track Map of the Southern Metropolitan Railroad Company, and the map has an annotation that the Mont. Co. Council authorized the removal of the bridge in 1967. The western abutment to that bridge is still in place and can be seen from the Interim CCT.


The eastern abutment to the Brookville Pike Bridge,
across the Interim CCT from the Grubb Road access path.

Brookville Pike worked with the existing grade in the area to get enough elevation to clear the railroad – it used no switchback. When the Grubb Road access path to the Interim Trail was built in 1996, the western bridge abutment had to be removed so the path could be cut into the hill to get down to the railroad grade. There is no need for a switchback here for a new pedestrian bridge if we use the existing elevations in the area effectively.

At Lyttonsville Place: Under the new plan, anyone wanting to reach the CCT or Purple Line Station from the Claridge House area will need to use a rebuilt Lyttonsville Place Bridge. Traffic on the roadway is heavy and fast. It will be essential that the new bridge have a generous pedestrian and bicycling path with a physical barrier separating it from the roadway. I would suggest at least a 5′ sidewalk and adjacent 8′ bicycle path on the east side of the bridge. This pathway should extend the full length of Lyttonsville Place to Michigan Avenue.

At Stewart Avenue: As for the Lyttonsville Place Bridge, the new Stewart Avenue Bridge will be an essential crossing for area residents to reach the CCT and Purple Line Station. It will also need a strong pedestrian/bicycle path on its west side. The path should extend down Stewart Avenue to Kansas Avenue.

At Talbot Avenue: Under the new plan, local access to the CCT that had been planned at the end of Kansas Avenue and Michigan Avenue will be lost. Lyttonsville residents who want to go east on the CCT from the general area of Rosemary Hills Elementary School will want to access the CCT via. Talbot Avenue and the Talbot Avenue Bridge. This access would be important even under the old plan, because pedestrians will strongly resist walking north to a Michigan Avenue access point if they intend to go south on the CCT.

The Talbot Avenue Bridge is planned to be extended at its west end to accommodate the Purple Line, but to remain with the same center span structure in the same location. Little can be done to improve pedestrian access on the narrow bridge itself. But motor vehicle traffic patterns to the bridge are not expected to change, and the tight curves and stop signs slow motor vehicles so that the bridge works reasonably well now to carry the existing Georgetown Branch Trail traffic. We can live with the bridge much as it is for local trail access, the future CCT through traffic will not be using the bridge.

But more can be done to improve the one block of Talbot Avenue that leads up to the bridge. Motor vehicle traffic is faster and more intimidating on Talbot Avenue than on the bridge. A sidewalk should be planned along the west side of Talbot Avenue from Lanier Drive to the stop sign at the end of the bridge.

The CCT can work with the proposed new alignment.

I regret that this post is so long, but there are many issues to consider in this new MTA Purple Line plan. I believe that when everything is considered, there are fair trade-offs. The CCT can work about equally well under either an alignment on the north side or south side of the Purple Line in the Lyttonsville area – provided good attention is paid to the trail and local access as the design progresses. The MTA has made a reasonable case that the proposed change will make the Purple Line work better. Trail users and the community should give the MTA proposal fair consideration.

Green Trail at Fenwick Station

October 4th, 2011

Update: Planning Board approves application at its Oct. 13 meeting.

The Gazette reports that the Planning Board has approved the Fenwick Station application, with the stipulation that a bike share station be built with the project.

October 4, 2011

The Silver Spring Post Office at the corner of Second Avenue and Spring Street is being sold. An application is being presented to the Planning Board on October 13 for a six story residential building on this site, called Fenwick Station. The M-NCPPC website has posted the staff recommendation at Fenwick Station Project Plan.

This project plan includes a proposed extension to the Silver Spring Green Trail, a pathway along the future Capital Crescent Trail, and space reservation for a future bike share station.

Project Plan for Fenwick Station
Fenwick Station preliminary plan
(click on image for a larger view)

The proposed Green Trail is along Second Avenue (along the top of the above plan), the future CCT pathway is behind the building, and space would be preserved for a future bike share station at a proposed public plaza (at the corner of Second Avenue and Spring Street, at the upper left corner of the above plan). There is also a connector path planned from the corner of Second Avenue and Spring Street to the future CCT.

From the staff recommendation:

The 2005 Countywide Bikeways Functional Master Plan recommends the Silver Spring Green Trail (shared-use path; SP-10) along Second Avenue/Wayne Avenue between Spring Street and Sligo Creek Parkway/Trail (8-foot wide trail with an adjoining 5-foot wide sidewalk). This trail currently exists between Cameron Street and to the east of Fenton Street, and is on the east side of Second Avenue/north side of the Wayne Avenue. The trail is proposed to be shifted to the west side of Second Avenue between Fenwick Lane (West) and Spring Street, along the subject property frontage as part of this development. Staff has worked with the applicant and MCDOT to ensure that this shift is appropriate given the proposed bike-share station at the intersection of Spring Street and Second Avenue, connection to the future Capital Crescent Trail from Spring Street/Second Avenue at this location, and the number of driveways/curb-cuts that currently exist along the east side of Second Avenue between Spring Street and Fenwick Lane (East). The remainder of the trail between Fenwick Lane and Cameron Street may be accommodated safely and adequately along Second Avenue with a crossing at the Second Avenue/Fenwick Lane (East) signalized intersection.

The Countywide Bikeways Functional Master Plan also recommends the Georgetown Branch Interim Trail (shared-use path; SP-6; the future Capital Crescent Trail), to the west side of the property, within the Third Avenue right-of-way. The applicant is providing an interim trail within the Third Avenue right- of-way that connects to the subject property, which will ultimately be replaced by the future Capital Crescent Trail that will be provided as part of the proposed Purple Line transitway project.

When I first saw the plan for this extension for the Green Trail at a neighborhood meeting last week, I was skeptical. There are two problems with the concept:
1) the trail will switch to the other side of the street at the light at Fenwick Lane, after running only one block in front of the Fenwick Station development, and
2) the configuration of an 8′ wide trail immediately adjacent to a 5′ wide sidewalk fails to strongly define the bicycle space. This configuration is the same as now exists for the Green Trail between Cameron Street and Colesville Road just two blocks to the south, and pedestrians use it as a glorified sidewalk while few cyclists use it. The sketch of the proposed configuration presented in the staff report, and below, inadvertly makes the point by placing a pedestrian squarely in the center of the bike path instead of in the adjacent pedestrian sidewalk.

Profile of Green Trail
Green Trail profile at Fenwick Station

But I can warm up to this Green Trail extension now that I see a bike share station is also proposed. The Green Trail can combine with the bike station at the corner of Second Avenue and Spring Street, and the access path to the CCT along Spring Street, to make a strong statement at a very visible entry point to the Silver Spring CBD about bikes belonging.

Similarly the proposed pathway behind the building and near the future CCT alignment can have an enhanced impact for showing the potential benefit of the future CCT. The pathway, along with the regrading that will occur there, will clean up the littered and badly eroded area there now. The pathway will connect to the Woodside trail to give an attractive footpath continuous from South Springwood in the Woodside neighborhood to Fenwick Lane in the CBD. It will be easier to imagine what the CCT can do for Silver Spring when a significant piece of the alignment can be experienced, even if only as a footpath.

Lyttonsville follow up meeting Oct. 3

September 27th, 2011

The MTA Purple Line project team has scheduled a follow up meeting to address questions raised at the Sept. 13 Lyttonsville Station area work session and reported here.

MTA map of Lyttonsville Staion area

MTA map of Lyttonsville Station Area

From the MTA email meeting announcement:

“…We wanted to make you aware of a meeting being held on the Maryland Transit Administration’s (MTA) Purple Line Project. Members of the Lyttonsville and Rosemary Hills communities have requested that the MTA come out and provide additional information on the plans proposed for this area. The meeting will be held on Monday, October 3, 2011 at the Gwendolyn E. Coffield Community Center at 2450 Lyttonsville Road, Silver Spring, Maryland 20910 at 7:00 pm.”

“At the MTA’s meeting held on September 13th, information was presented on some design changes that are proposed for the Lyttonsville Station area. These new proposed plans included a change in the layout of the yard and shop, which would result in a change of where the tracks are located and moving the station to along Brookville Road. At this upcoming meeting the Purple Line Project team members will present additional information, requested by the community, which relates to those proposed changes.”

MTA will also be returning to the area two days later, on Wednesday, Oct. 5, to hold a Connecticut Ave./Chevy Chase Lake Station area work session at Bethesda-Chevy Chase High School, 7 p.m.

New Lyttonsville area Purple Line/trail plans

September 15th, 2011

Cross posted at GreaterGreaterWashington and at Washcycle.

MTA has posted the materials it presented at the Sept. 13 Lyttonsville neighborhood work group meeting. The presentation and project maps are on their website at Lyttonsville station area.

The most useful of these project maps for understanding the new plans for the future CCT through this area is the Design Option Roll Map.

Lyttonsville station area Purple Line map
Partial view of the Design Option Roll Map
(Click on image for the full map.)

I will attempt to list the significant changes for the CCT in the area plan, from the Rock Creek Park east to the CSX corridor. I recommend that the Design Option Roll Map be used to follow along.

  1. At Rock Creek: The CCT remains on the north side of the light rail tracks. The prior plans called for the CCT to switch from the north to the south side of the tracks at the Rock Creek trail bridge. The new plan holds the trail on the north side. The trail bridge is simpler since it does not have to twist under the Purple Line bridge. The access ramp from the CCT down to the Rock Creek Trail would be like before, except that it would be built on the north side of the berm. (Note that this access ramp is still under discussion between MTA and M-NCPPC. There are concerns about cost and the impact on the trees on the side of the berm, and a decision could be taken to just continue to use the existing connection on Susanna Lane.)
  2. At Grubb Road: A new bridge will carry the access path across the Purple Line tracks to the CCT on the north side. The drawings show a long switchback ramp to provide the elevation needed for the new access bridge. But the access path is roughly along the same alignment as the old Brookville Road bridge that crossed over the B&O tracks here long ago. The old bridge abutment can still be seen on the north side of the corridor from the Interim CCT. The railbed elevation is already well below the elevation the access path has now, and I believe the extent of the switchback ramp shown in the drawing is grossly overstated. When I asked Purple Line project manager Mike Madden about this, he indicated the ramp in the drawing was only conceptual and was not based on any elevation measurements, so it is likely overstated in the drawing.
  3. Grubb Road to Steward Avenue: An access trail paralleling the main trail. The drawing shows two trails alongside each other along the south side of Brookville Road. The main CCT is the wider trail (to be 12 feet wide) that is next to the Purple Line tracks. It goes under the Lyttonsville Place bridge and under the relocated Stewart Avenue bridge. The access trail is the narrower trail (to be 8′ wide) that is adjacent to Brookville Road and between Brookville Road and the main CCT. It serves as a Brookville Road sidewalk and also gives access to the main CCT between the Lyttonsville Place and Stewart Ave. bridges. The access trail crosses Lyttonsville Place and Stewart Avenue at-grade at the north end of the bridges.
  4. At the Lyttonsville station: The CCT is on the north side. Under the old plan, the Purple Line tracks and station were on the south side of the storage tracks in this area, and the trail was on the south side adjacent to the industrial lots through this area. Under this new plan, the trail and PL tracks are flipped to the north side closer to Brookville road. Note that MTA is considering moving the transit station location further east, closer to Stewart Ave. This would place the station closer to the entrance to the Walter Reed Annex – the area’s largest employer.
  5. At Stewart Avenue: A grade-separated crossing. It is proposed to shift part of Stewart Avenue to line up with the main entrance to the Walter Reed Annex, and to have Stewart Avenue cross over the CCT and the Purple Line on a new bridge. The old plan had both the trail and transit crossing Stewart Avenue at-grade. This change would remove the only at-grade roadway crossing on the CCT between Bethesda and Silver Spring, making the rebuilt trail 100% grade separated.
  6. At the CSX corridor: A relocated trail bridge. The CCT would cross over the CSX tracks on a new bridge similar to the old plan, but the bridge would be shifted to the north closer to Kansas Avenue. This would not be a significant change for the trail, but does reduce the impact of the Purple Line on Talbot Avenue. Talbot Avenue could remain as a two way street as it is now, and much less r.o.w. would need to be taken from the several homes on Talbot Avenue.

Overall I consider flipping the CCT from the south to the north side to be roughly an even trade for trail users. Access will be slightly more inconvenient from neighborhoods to the south, but easier from the neighborhoods and businesses on the north. The trail will be closer to Brookville Road – with more traffic noise. But it will also have a new grade-separated crossing at Stewart Avenue. Much like the lengthy discussion of north vs. south in Bethesda/Chevy Chase, your preference will be determined largely by whether you live or work on the north vs. the south side of the corridor. As always, much will depend on the details to be developed during the next design phases.

The MTA map of the Impact Comparison shows that the overall footprint of the project is little changed through this area. A few feet of r.o.w. would be taken on the north side, but a comparible area is spared on the south side. The notable exceptions are the parking structure for the Purple Line maintenance yard employees that would be built where the car storage lots are now, and the realigned section of Stewart Avenue that would be built where the landscaping stone storage yard is now.

Some residents from neighborhoods on the south side of the project are making claims that the new plan will impact them much more than the older plan, Proposed Purple Line stop for Silver Spring raises residents’ eyebrows. But I don’t buy it. The most active part of the project, the Purple Line main track and station, are moved farther from the south side neighborhoods. The storage tracks and maintenance building are only a few feet closer to the south side residences than in the older plan, and still have good separation from the residences. The parking structure will be closer to the Claridge House high-rise, but will a parking structure used by the approx. 200 employees really be that much worse than the car storage lots and landscaping business lots that are there now? Detailed noise studies have been promised by MTA.

New plans for CCT at Lyttonsville

September 15th, 2011

Updated with a gmaps aerial photo at 6 pm on 09/15/11

I haven’t posted to this blog recently because the summer has been a quiet period for trail development in the Silver Spring area. But planning activity is picking up now that summer is over.

The MTA briefed local residents on new plans for the Purple Line and CCT in the Lyttonsville area at a neighborhood work group meeting this Tuesday, Sept. 13. The Gazette reports on this meeting at Proposed Purple Line stop for Silver Spring raises residents’ eyebrows. The new plans are significanly different than shown before – the future CCT and the Purple Line work yard are flipped in their positions, so that the CCT is proposed to run along the north side of the Purple Line transit/trail corridor from Rock Creek to the CSX corridor.

I was at the meeting, and my first impression is that this change is roughly neutral for the CCT. The Gazette report mirrors the very negative reaction of the local residents, and is very inaccurate. For example, the Gazette reports the CCT will be moved to the north side of Brookville Road, but the new plan does NOT put the trail on the north side of Brookville Road at all. The new plan has a few benefits for the trail and community that the Gazette does not mention, for example providing a new grade-separated crossing of Stewart Avenue for both the Purple Line and CCT.

MTA promised to post the drawings on their website in a week or so. I will revisit this issue here as soon as the drawings are available, and will show then point-by-point what the changes are for the proposed CCT. You will see why I am so critical of the Gazette report – the drawing shows the Gazette is just so wrong on some of the big “facts” they reported.

Update:

I am being taken to task by local residents for my assertion that the local area is so industrial that the proposed changes will not detract seriously from the back yards of the south side residents. While we wait for the MTA Purple Line plans to be posted on the web, I offer the Gmap aerial view below to support my claim. The nearest residential back yards are on the Albert Stewart Lane cul-de-sac, the yards seen below in the lower right corner. They are now separated from the Interim CCT by the landscaping storage yard seen in the center, and will still be separated from the Purple Line storage tracks and Purple Line transit by most of that industrial area after the project is built. Claims that these back yards will be harmed by the Purple Line are gross exagerations.

I also invite everyone interested in this topic to walk or bike the trail here, see the existing uses, and judge for yourself.


View Larger Map

a nature trail

July 19th, 2011

The Washingtong Post has an article on community development around future Purple Line stations, at Lack of money doesn’t stop Purple Line station development plans. The article only discusses the impact of the Purple Line on the trail very briefly, with this quote from Purple Line opponents:

“It would change the trail from what it is today — a nature trail through a quiet community — into a strip of asphalt through an urbanized area,” said Bill Schulz, a board member of Friends of the Capital Crescent Trail.

The Post article does not quote any trail users who support the Purple Line. But the Post print version of the article has a good photo that would have helped Purple Line supporters make their point if they had been asked, available online at: a stretch along Connecticut Ave.

The photo shows trail users at Chevy Chase Lake looking toward the pedestrian barrier at Connecticut Avenue, and watching the many automobiles stream by. This is the “nature trail” to be saved at Chevy Chase Lake? And when did asphalt become a bad thing to have for the Capital Crescent Trail?? Many trail users would agree that a trail bridge and asphalt paving would be welcome here.

Bikes on light rail

July 10th, 2011

The Washington Post has a feature article Phoenix offers lessons for Purple Line that is well worth reading. A photo album and video are with the article that provide a good look at what a modern light rail looks like.

Check out the video to see how well the Phoenix light rail accommodates bicyclists – you can see cyclists boarding about 45 seconds into the video. Smooth!

The future CCT at Chevy Chase Lake

June 11th, 2011

Cross posted at WashCycle and GreaterGreaterWashington.

Chevy Chase Lake is where the Interim CCT crosses Connecticut Avenue. It is now a collection of small shops including Starbucks, two gas stations, a supermarket, a lumber yard, and the 13 story Chevy Chase Land Company office building that has City Bikes at the ground level. HOC residential buildings along Chevy Chase Lake Drive are also part of the sector. Parking lots cover much of the area.


View Larger Map
Interactive Google Map of Chevy Chase Lake

Trail users know Chevy Chase Lake for the long waits
at the traffic light to cross Connecticut Avenue.

Two big projects are coming that will change the trail and Chevy Chase Lake – the Purple Line and the Chevy Chase Lake redevelopment.

The Purple Line – with a CCT bridge over Connecticut Avenue:

The safety and convenience of crossing Connecticut Avenue on the CCT will improve greatly when the Purple Line is built. The plans call for the CCT to cross Connecticut Avenue on a trail bridge alongside the Purple Line light-rail bridge. The trail will have a direct connection to the elevated station platform on the east side of Connecticut Avenue. The MTA aerial photograph below shows the route of the Purple Line and CCT through Chevy Chase Lake, and the location of the station platform. More aerial maps are available at MTA’s Purple Line website that show better detail.

Future CCT bridge crossing of Connecticut Ave.
(source: MTA Purple Line aerial photograph)

The CCT will be elevated through much of the Chevy Chase Lake sector, on the bridge over Connecticut Avenue and at the transit station platform, and on the trail ramps that approach from both sides. This may become important, because future development may bring much local pedestrian activity to the sector. The trail elevation will allow us to keep trail/local pedestrian conflict areas limited to the designated trail access points.

The Chevy Chase Lake redevelopment – two competing visions:

On April 27, 2011 the Chevy Chase Land Company (CCLC) presented its vision for Chevy Chase Lake to the public at the National 4-H Youth Conference Center. That presentation is available as a YouTube video. Several illustrative drawings from that presentation were also shown in the Purple Line Progress Report that PLN President Ralph Bennett presented to the Affordable Housing Conference of Montgomery County on May 9, 2011.

Chevy Chase Land Company Illustrative Site Plan
(click on image for a larger view)

The CCLC vision is for transit oriented development of up to 4,000,000 sq. ft. of mixed commercial/residential uses, with about 3/4 of the development being residential (up to 3000 residential units). Building heights transition from 6 stories high at the edges to up to 19 stories high near the center. The plan features a local street grid with extensive public spaces, a public plaza at the Purple Line station, and neighborhood oriented ground level retail.

CCLC illustrative drawing of proposed Main Street public spaces

Looking west on the proposed Main Street
(the arrow at the left side marks the CCT ramp up to
the light rail station and bridge over Connecticut Ave.)

Montgomery County planning staff released a narrated video to present their very different recommendations for the new Chevy Chase Lake sector plan on June 8, 2011. That video is available on their Chevy Chase Lake webpage. The planning staff is recommending to the Planning Board that a smaller portion of the Chevy Chase Lake Sector be rezoned to allow slightly over 1,000,000 sq. ft. of mixed use (commercial/residential) development, 250,000 sq. ft. now and another 800,000 sq. ft. to be allowed when Purple Line construction begins. This is only slightly greater than that approved now under the current zoning. Building heights would be limited to 65 feet, only about six stories. (The CCLC building already on the site is 13 stories high, and a residential building now stands immediately south of the site alongside the Columbia Country Club that is 18 stories high.)

The CCLC and the Montgomery County planning staff visions differ greatly on the density to ultimately be allowed at Chevy Chase Lake – with the planning staff recommending only a marginal increase in the number of residential units over that already approved. The Montgomery County planning staff will hold a public meeting to present its recommendations at 10 a.m.-noon Saturday, June 18 at the Chevy Chase Village Hall, 5906 Connecticut Avenue.

Does the density at Chevy Chase Lake matter to trail users?

The major features of the CCT itself will not be impacted much by the different levels of density being proposed for the Chevy Chase Lake redevelopment. The trail ramps and bridge will not change, and most of the trail will be separated from the local pedestrian activity by being on elevated structure. Both the CCLC and the planning staff visions call for a public plaza at the Purple Line station, and the CCT would pass through that plaza area. A higher density would make this a more pedestrian active area. But careful design of the pedestrian crossing paths in this plaza will be mandated by the need to keep pedestrians clear of the light-rail activity that parallels the CCT. Pedestrian crossings will likely be focused to only one or two points and this will minimize the trail/pedestrian conflict areas.

A higher density at Chevy Chase Lake will have a bigger impact on trail users when they leave the primary trail in this area. Higher density with taller buildings makes it more likely we will have a good local street grid with public spaces, like that envisioned by CCLC. If the building height is limited to 65′ as called for by planning staff, then a developer must cover more available land with low buildings to get up to the FAR (floor-area-ratio) allowed by the zoning. A smaller project will also give less economic justification to set aside space for wide streets and public spaces, and the County will have less leverage to require these amenities as a condition for the project. There may be less local pedestrian and motor vehicle traffic in a smaller project, but the local street grid may be more limited, streets may be narrower, and space set aside for public use may be smaller so biking conditions could feel congested even with less traffic. Smaller may not be better for bicycle friendly conditions overall.

Trail users don’t have a strong reason to enter the discussion of density at Chevy Chase Lake to protect or advance the CCT. We have other reasons to join the discussion about how our region will grow, however, as members of the community. Trail users are likely to have diverse views about “smart growth” and “transit oriented development”. I’m joining the discussion as an individual in support of a higher density at Chevy Chase Lake. Opportunities for transit oriented development are very limited. We have a strong need for more residential housing to balance with jobs in the Bethesda area – especially for housing close to the National Naval Medical Hospital where up to 2500 new staff positions are coming with BRAC. If we won’t allow more residential housing units here, then where else should it go that is better?

And besides, I want to have one of those residential units. I’d love to live in a place like this.