I-95 / US Rte. 1 Interchange
Client: VDOT
Location: Alexandria, VA

ALA was responsible for drainage design, including inlets, storm drains, culverts; utility design, including water mains, sanitary sewers, & stand pipe system; and design of two curved ramp structures on this interchange reconstruction. Utility design involved the relocation of 3,000 LF of 42” Potomac Interceptor for the Alexandria Sanitation Authority, relocation of various water mains from 6” to 12” size including a 12” line on Route 1 Bridge for the Virginia American Water Co., and a standpipe system for Rte 1/I-95 Interchange. ALA also provided design for two new ramp structures carrying traffic from eastbound I-95 to northbound U.S. Route 1 in Alexandria, VA. Bridge B-629 is a 180-ft long structure with three spans at 60-ft long each. The structure consists of a reinforced concrete deck on prestressed concrete bulb-tee beams made continuous for live load supported on reinforced concrete pile bents. Bridge B-630 is a 1,750-ft long structure consisting of a reinforced concrete deck on prestressed concrete bulb-tee beams and AASHTO prestressed concrete beams – all made continuous for live load - and continuous curved steel girders. The structure features a reverse horizontal curve with baseline radii as low as 170-ft, and a variable deck width.