The existing Portageville Bridge, built in 1875, is a 820-ft long steel viaduct crossing the Genesee River in Letchworth State Park. Norfolk Southern needed a more reliable, long-term, and equally iconic solution to this aging link in their Southern Tier Route, all while minimally impacting rail traffic.
After performing an inspection and rating to confirm the near-exhausted service life of the structure, Modjeski and Masters (M&M) developed conceptual replacement designs that were showcased through a Visual Impacts Analysis. Each alternative design used an adjacent parallel alignment to maintain rail traffic throughout the construction process. M&M then performed preliminary and final design services for the selected long span steel arch bridge, which would both minimally impact the environment and serve demands of Class 1 Heavy Freight for many years. M&M is now performing support services during the construction of the iconic new structure.
|Existing Typical Truss Span Length||100 feet|
|New Main Arch Span Length||483 feet|
|Total Project Length||819 feet|
|Tracks on Structure||One railroad track|