Cost estimating for one of Philadelphia’s most complex bridge reconstruction projects considered the tight construction schedule required by the City.
Cost Estimate for South Street Bridge Rehabilitation, Philadelphia, PA
Reconstruction of Philadelphia’s South Street Bridge — a key Schuylkill River crossing linking University City with Center City — was an early move towards the bicycle — and pedestrian-friendly infrastructure the city is becoming known for. Urban provided cost estimating services for the project, which involved demolition of the 1,800-foot-long bridge; construction of a wider, 2,200-foot-long, 12-span steel girder bridge and two I-76 ramps; and modifications to stone masonry retaining walls on the east approach.
South Street Bridge Rehab
The Challenge: Estimate Accounts for Logistical Challenges
Our contractor-type bottom-up estimate accounted for the many logistical challenges posed by the bridge’s location — it spans the Schuylkill River, four railroads (two electrified), I-76 ramps, a train station, and University of Pennsylvania athletic facilities. In completing the estimate, we also considered marine work associated with the project and the tight two-year construction schedule demanded by the City.
Our Solution
Drawing from their experience working for heavy contractors, our highly-skilled and vastly experienced cost estimators emulated a construction contractor’s bid. The estimate incorporates the constructability and risk factors that can often influence the bid price of complex projects.
Bridge Enhances Links Between West and Central Philadelphia
Opened in 2012, the South Street Bridge has greatly improved traffic and connections between West Philadelphia and Center City. Its bike lanes, wider ADA-compliant sidewalks, and link to a multi-use river trail have encouraged sustainable transportation in some of Philadelphia’s fastest growing areas.
Highlights
- Unique details, such as lighted architectural gazebos and 50-foot-high LED towers
- Bike lanes in both directions
- Extra wide handicapped-accessible sidewalk
- Model of “complete streets” principles (the bridge serves pedestrian, bicycle, and vehicle traffic while providing easy access to public transportation)
- Construction of stone masonry retaining walls
- Spans the river, four rail lines, and an interstate highway
- Stringer, deck, and bearing replacement
south street bridge below
