Posts about L'Enfant Plaza

They analyzed a number of options and condensed them down to 3 bicycle and pedestrian options, 4 roadway options, and 6 Transportation Demand Management options. This post looks at the roadway and TDM alternatives; the next one will delve into the bicycle and pedestrian options.

Vehicular options

One of the most significant conclusions from the draft EIS is what it chose not to recommend: More single-passenger vehicle capacity. The team looked at adding new general-purpose lanes (which, on a freeway-type bridge, aren't as much "general purpose" as "motor vehicle only") or HOT lanes. Once Virginia decided not to run HOT lanes through Arlington, the HOT lane options became moot, and adding new auto capacity generally did not reduce congestion.

There are 5 remaining proposals that would affect motor vehicles:

Add a bus lane. A lot of commuter buses drive to the Pentagon and then over the 14th Street bridge to DC, and many local buses also cross in this area. This alternative would use the existing shoulder of the Rochambeau bridge (the center of the 3 road bridges, which carries the express lanes in both directions) for a bus lane, and convert one lane on 14th Street to a bus lane.

The heavy volume of buses moves a great many people in this corridor. Helping buses bypass congestion and give riders a quicker ride would further improve the value of taking transit from many parts of Virginia.

Ban left turns at 14th and C (at a cost of about $203,000). C Street SW ends at 14th, in the last intersection with a traffic signal before the bridge. The study says that giving time for vehicles to turn left from southbound 14th onto C, or left from C onto southbound 14th, creates significant delay, and this option would forbid these turns. Drivers would only be able to turn right in or out of C.

Click to enlarge (PDF).

On its own, this sounds like a bad idea because it would move further away from a functional grid in this area, and make 14th more like a freeway. It could, however, be a reasonable way to reduce some of the extra delay that comes from the bus lane option, making that a little more palatable.

The most important question, which the report does not specify, is how this would affect pedestrians. People cross on foot to get to and from the Holocaust Museum, for instance, and already the signal here forces them to wait long periods of time for the various movements. Removing the left turns could allow more pedestrian crossing time, or it could make things worse, depending on the final signal timings.

DC should also add a marked crosswalk along the south side of this intersection, where there is none today. Every side of every intersection ought to have a marked crosswalk, regardless of its effect on traffic, but an animation of the proposal makes it appear that there would be no traffic effect with left turns prohibited, anyway.

For the final EIS, the team should investigate pedestrian crossings and suggest timings that help them cross more safely and with a shorter wait.

Restripe around Maine Avenue, 7th and 9th Streets ($185,000). There are a lot of ramps on and off in this area, creating a lot of merging and weaving. This option would narrow the on-ramp at Maine Avenue to 1 lane instead of 2, reducing the amount of merging on the freeway itself.

Also, it would add a solid white line between some of the freeway's lanes east of 9th Street. Drivers getting on at 7th Street would only be able to then continue to the 3rd Street tunnel (the one that goes under the Mall to New York Avenue, also signed as I-395), and drivers getting on from 9th Street would have to continue onto the Southeast Freeway (now signed as 695) instead. Drivers might ignore this line, but FHWA hopes it will decrease weaving.

Click to enlarge (PDF).

Remove some ramps on the Virginia side ($2.7 million). There are 10 ramps on and off 395 right around the Pentagon, also creating a lot of merging and weaving. This alternative suggests removing the ramps from 395 northbound to the GW parkway northbound, and the matching ramp from the GW Parkway southbound to 395 southbound. Drivers can still get where they need to go by taking Washington Boulevard (Route 27) instead, which is actually shorter, anyway.

In addition, this alternative would change around the ramps at Boundary Channel Drive, the access road to the Pentagon north parking lots. Now, there are cloverleaf-style ramps on and off of 395 southbound, so that cars coming from or going to each direction of Boundary Channel have their own ramps.

Instead, the ramps in the southwest quadrant would go away, and the northwest quadrant ramps changed so that cars can turn in either direction on and off of Boundary Channel.

Ramps in gray would be removed. Click to enlarge (PDF).

Arlington has proposed another option to add roundabouts instead of traffic signals at the ends of the ramps.

Potential roundabouts on each side of 395. Click to enlarge (PDF).

Transportation Demand Management options

Reconfiguring roadways is not the only way to reduce congestion. Transportation Demand Management is the field concerned with helping people better understand their travel options besides solo driving. Maps, real-time information, and public service ad campaigns can help people choose transit. Employers can provide incentives or assistance for people to carpool, telecommute, or commute outside peak hours.

The TDM options that the DEIS proposed to carry forward to the final version include:

• Expand incentives for telecommuting
  
• Expand flexible work hours
  
• Increase prices for parking and/or decrease supply
  
• Better coordinate among agencies along the corridor (Federal, District, state, and local) to share information and respond to crashes or other incidents
  
• Create a program to educate drivers in the corridor in "[crash] avoidance maneuvers and defensive driving skills"
  
• Make signs better and more consistent across the corridor

The study team is accepting comments on the draft EIS until March 15th. They will then begin work on the final EIS. I will send them all comments made on this post through at least the end of Wednesday, March 14. If you want to send them your own, more detailed comments, you can do so through this form.

The bicycle and pedestrian proposals, meanwhile, are worth a whole discussion on their own. Part 2 will examine these in detail.

Regardless of the final path that future development will take in the neighborhood, all three proposals would deck the CSX rail line to extend Maryland Avenue SW, include some degree of infill development, and vastly improve the connection between Benjamin Banneker Park and the Southwest Waterfront.

Rehabilitation

Rehabilitation proposal. Click for full poster.

Under the Rehabilitation proposal, future development of the Ecodistrict would focus on retooling the vastly inefficient 60's and 70's era federal buildings that currently dominate the site. This would primarily involve a vast upgrade of the heating and cooling systems present in many of these buildings, enhancing stormwater management, and increasing on-site electricity production and conservation.

Some of the buildings may also start to incorporate residential and commercial uses in order to enhance the diversity of the neighborhood. While no buildings would be removed under this option, it would cut away the Department of Energy's overhang that currently cuts off views along 10th Street of the Smithsonian Castle to the north.

Furthermore, it would enhance the current network of streets by adding a number of new intersections and enhancing the neighborhood's connectivity.

Redevelopment

Redevelopment proposal. Click for full poster.

The Redevelopment proposal includes many of the elements of Rehabilitation, such as the energy-efficiency and stormwater elements, but it goes a farther in some key respects. Instead of just cutting out the 10th Street overhang, this plan would completly demolish the Department of Energy's James Forrestal building, replacing it with a number of new structures.

The great appeal of this plan is that it will open up brand new views of the Washington Monument from Virginia Avenue SW. The plan also seeks to deck over a portion of I-395 between 10th Street and 9th Street, increasing the number of potential buildings along the corridor and partially removing the unsightly highway from view.

This Redevelopment proposal also goes the farthest to enhance the connectivity of the street grid by breaking up the Department of Energy superblock and adding the greatest number of new intersections to the neighborhood.

Repurpose

Repurpose proposal. Click for full poster.

NCPC's final proposal is the simplest. It focuses on repurposing several federal buildings to new uses. The buildings with the most potential include the nearby US Postal Services Library, the General Services Administration Building, and the FAA's Orrville Wright Building.

NCPC believes that simply repurposing these buildings and renovating others to more efficiently use their space could yield up to another million square feet of space in which to add neighborhood amenities.

Connectivity changes in each of the 3 plans. Click for full comparison poster.

No plan has been set in stone, and any future development will likely include bits and pieces from any or all of these proposals. All seek to enhance the neighborhood by adding new amenities, including restaurants, retail, and cultural destinations that will not only draw new residents to the area but also pull some of the millions of tourists away from the National Mall and towards the cultural amenities of our fair city.

Hungry government employees will often walk down the steep hill from Benjamin Banneker Park and cross busy Maine Avenue SW to reach the Waterfront for lunch. Physical and psychological barriers including the nearby CSX tracks, the Southwest Freeway, and the unnerving presence of supersized federal office buildings gives the area a disjointed feel that makes walking around the area quite demoralizing.

In spite of these challenges, this part of DC has quite a bit to recommend. The area is one of the most transit-accessible locations in the Washington region. L'Enfant Plaza Metro station provides four entrances to four of the system's most heavily used lines.

The area also benefits from a direct commuter rail link to Virginia along with dozens of commuter buses, Metrobus, and the DC Circulator. The Ecodistrict's proximity to the National Mall and important job centers downtown and in emerging areas of employment around the Waterfront and Navy Yard make this area especially attractive.

The Southwest Ecodistrict task force seeks to enhance this strong foundation with a complete facelift of the neighborhood. Comprising 15 federal and local agencies including the National Capital Planning Commission and the DC Office of Planning, the task force is actively working to finalize their design for the area.

The heart of the plan works to reshape both 10th Street and Maryland Avenue. These two streets will form the new "heart" of the Southwest Ecodistrict. Current proposals seek to examine the feasibility of morphing the current ramshackle collection of federal office buildings into unique pedestrian-friendly corridors that complement the federal offices nearby with extra retail and housing options. Current plans also emphasize the importance of establishing a strong physical and visual connection between the National Mall and the Southwest Waterfront.

To achieve these goals, the task force will examine the feasibility of infill development and complete redevelopment of existing structures along the corridor. The task force is also investigating the potential to deck over a portion of the Southwest Freeway to spur new development along 10th Street SW.

They are also proposing to deck over the CSX rail line, to reestablish Maryland Avenue SW according to the original L'Enfant plan. This proposal will provide a direct connection from the Southwest Ecodistrict to the Capitol and restore the grand view sheds of the Capitol Building along a restored urban boulevard.

Last, the task force intends the redesigned neighborhood to be a showcase in sustainability and eco-friendly practices. Currently, many of the buildings in the Ecodistrict utilize inefficient power and rainwater disposal methods.

The task force has proposed making the existing buildings more energy efficient through retrofitting or simply demolishing and rebuilding if appropriate. The proposed solution to water runoff includes a number of potential solutions to trap and store water whether in green roofs or even in vast storage tanks underneath 10th Street SW.

If any one of these proposals manages to make it though the difficult planning process ahead, DC will be in store for a vastly different neighborhood just south of the Mall. The sheer potential to remake one of the most incoherent parts of the city is very exciting and a great move forward for the city.