ALA was a subconsultant for this large bridge project, for which the firm designed 11 bridges. This project required complex design of the bridges and interchanges to allow for the efficient staging of the construction, detailed maintenance of traffic, and major utility relocations. The 10 bridges are as follows: Inbound I-295 over M Street Bridges…read more »

ALA provided structural engineering services for at-grade stations at Wiehle Avenue and Tyson’s Central 7.  The structural components include a steel roof vault, canopy, mezzanine level concrete deck supported on structural steel framing, reinforced concrete columns, platform slab in service and non-service areas, foundation and station barrier walls.  Analysis and design of various rail alignment…read more »

Route 603 Beach Mill Road Bridge over Nichols Branch

Utilizing the results of the H/H analysis, ALA provided design services to replace the existing simple steel beam bridge. The new bridge is a 39’ long simple span galvanized steel rolled beams with glu-lam deck superstructure on cantilever abutments with Customrock formliner. The new bridge is 16‘-6” wide and with timber rails. Additionally, because of…read more »

ALA designed and prepared construction documents for this single span bridge replacement. The bridge is located in an environmentally and historically sensitive area with multiple overhead power lines and underground utilities in the immediate vicinity of the bridge. The bridge replacement accommodates two lanes of traffic and two 5’-6” sidewalks with safety railings. The bridge…read more »

ALA designed the widened 493-ft replacement of the Braddock Road Bridge on a 30-degree skew over I-495 to accommodate the reconfigured roadway for the addition of High Occupancy Toll (HOT) lanes. ALA also designed the replacement of the Annandale Pedestrian Bridge over I-495, as well as a new flyover ramp carrying I-495 southbound HOT Lanes…read more »

South Washington Street/Woodrow Wilson Bridge Urban Deck Retaining Walls and Multi-Use Trails ALA designed four pedestrian structures totaling 1,900-ft adjacent to the Urban Deck Bridge at Washington Street. The structures carry a 12-ft wide pedestrian trail as well as a sound barrier wall. Design included a wide variety of foundation types in order to accommodate varying…read more »

US Route 1 at Ft. Belvoir

This design-build project consists of the widening of a 3.68 mile segment of U.S. Route 1 (Richmond Highway) from Telegraph Road (Route 611) to Mount Vernon Highway (Route 235) in Fairfax County, VA from four through lanes to six through lanes, as well as the construction of new bridges over the Accotink Creek. These improvements…read more »

ALA has completed multiple assignments as a part of the General Engineering Consulting Team for the MTA Purple Line. Among them are the following: University Boulevard (MD 193) over the Northwest Branch. ALA provided the design of a three-span bridge that will replace the existing structure that carries University Boulevard (MD 193) over the Northwest…read more »

ALA performed an evaluation of this existing 550-ft long bridge to determine the most feasible method of rehabilitating and widening the bridge. Considerations included widening only, widening with existing deck replacement, and widening with existing superstructure replacement. ALA ultimately recommended that the existing superstructure be replaced together with the bridge widening. Considerations in the analysis…read more »

Seminary Road over I-395 Bridge Replacement and HOV Ramp Design-Build

ALA designed the replacement for the existing superstructure with a lightweight, reinforced concrete deck on continuous, curved, composite steel plate girders. The new superstructure was designed to accommodate forces and movements, including the connection between this bridge and the HOV Ramp bridge, such that the performance and maintenance are optimized for a 75-year service life….read more »

ALA provided the development of preliminary structural engineering (30% plans) for a cut and cover tunnel, Metro stations and facilities, a maintenance shop, retaining walls, bridges, wayside buildings, and parking garages for Phase II of the Dulles Corridor Metrorail Extension. Bridge assignments included: Dulles Metrorail Extension over Centreville Road: Preliminary design plans for the bridge…read more »

MD 201 Kenilworth Avenue over I-95 Bridge Widening and Deck Replacement

ALA provided inspection of existing bridge, as well as preparation of TS&L and final design plans for the widening and deck replacement of SB and NB MD 201 (Kenilworth Avenue) over I-495/I-95. ALA also completed the design of piers and abutments. The structure is a 4 span composite steel superstructure with 2 simple spans and…read more »

Pennsylvania Avenue SE Revitalization Project from 27th Street, SE to Southern Avenue, SE

ALA designed 1.5 miles of roadway improvements including sidewalk, drainage, erosion/sediment control, maintenance of traffic plans, and water main relocation for the Pennsylvania Avenue, SE Revitalization Project. Roadway Design Roadway design included new pavement, new curb, new sidewalk and bike path, and new retaining walls that included steps for access to residential and commercial properties. …read more »

I-95/Fort McHenry Tunnel Toll Plaza Addition of EZ-Pass Express Lane

ALA provided preliminary and final structural design services for modifications of the existing toll plaza canopy and pedestrian access tunnel to replace four existing cash toll lanes with two EZ-Pass Express lanes.  Modifications included removal of a portion of the existing toll plaza canopy and replacement with a modified canopy with relocated supports to accommodate…read more »

ALA provided design services for the replacement of Canton Viaduct, which carries I-895 over I-95 ramps, railroads and city streets, in Baltimore City. The existing structure, which was built in 1958, was in poor condition and some bridge elements did not meet design codes requirements for current loads. The new mainline northbound and southbound structures…read more »