Massive Bridge Project On U.S. Route 1 Over Mamaroneck River Finished

MAMARONECK, NY — A yearslong roadwork project in Westchester is complete.

Governor Kathy Hochul announced on Friday that major construction is complete on the project that reconstructed the bridge carrying U.S. Route 1 over the Mamaroneck River in Mamaroneck.

The project essentially rebuilt the 129-year-old stone arch bridge from the ground up, adding new structural supports to increase durability and make the bridge more accessible and better able to withstand floods and other severe weather events.

The $115 million project began in 2020 to replace or upgrade several flood-prone bridges in lower Westchester County and ensure that some of the area’s most important commuter routes are better prepared for the growing impacts of climate change. The Lower Westchester Bridge Bundle initiative also replaced two bridges on the Saw Mill River Parkway over the Saw Mill River in Pleasantville and the East Lincoln Avenue bridge over the Hutchinson River Parkway in the City of Mount Vernon/Village of Pelham.

"Whether it’s historic blizzards or record-shattering rain events, the impacts of climate change are being felt all across New York and we must do all we can to harden our infrastructure against this growing threat," Hochul said. "The reconstruction of the Route 1 bridge in Mamaroneck is the final piece of a transformative project that will keep travelers safe and help keep some of the busiest roads in the Lower Hudson Valley open and functioning regardless of the challenges that Mother Nature throws at us."

As part of the project, the original stone arch bridge was reinforced and strengthened with a cast-in-place concrete liner underneath and new foundation elements were drilled into the underlying rock.

The bridge was also widened and pedestrian walkways were created to improve safety and access.

In addition, new pedestrian safety improvements were implemented at the busy intersection of U.S Route 1 and Mamaroneck Avenue, including signals, curb ramps and crosswalks. The project also included the replacement of retaining walls and the embankment supporting Meighan Park (Harbor Island Pocket Park), the small walking park on the southwest corner of the bridge structure.

"New York is investing like never before to combat the threat of climate change under the leadership of Governor Kathy Hochul and the completion of this bridge project in Westchester County is further proof of that," New York State Department of Transportation Commissioner Marie Therese Dominguez said. "The upgrades to the U.S. Route 1 bridge will enhance safety for all users of the transportation system and allow the bridge to better withstand the heavy rains and flooding that are becoming more and more common as our weather changes."

Due to the six-to-eight-foot tidal influx of the river, divers and special equipment were used during the project. The new bridge structure was constructed off trusses which spanned the entire width of the Mamaroneck River under the existing bridge.

"I commend Governor Kathy Hochul for her leadership and vision for the U.S. Route 1 Bridge over the Mamaroneck River, which was a long-awaited project to repair a vital travel route for drivers in Westchester County," Westchester County Executive George Latimer said. "The new bridge consists of a more durable structure to enhance motorist safety, and has been widened to allow for pedestrian walkways creating easier access to the community. We believe very strongly in fixing our bridges, roadways and other critical infrastructure across the County, and this new bridge will serve as a real improvement to both commuter and pedestrian traffic alike."