Marsh Drive Bridge Replacement Over Walnut Creek

Contra Costa County Public Works Department and Bridgeway Civil Constructors, Inc have teamed up once again to replace the Marsh Drive Bridge over Walnut Creek. The two-stage project began in June 2021 and is expected to be completed by October 2022. The purpose of the project is to replace the existing bridge that was built in 1938 with a new 5 span cast in place/prestressed voided slab bridge that will have two lanes of vehicular traffic and a 10-foot-wide separated bike and pedestrian facility on the south side of the bridge in its final configuration. All superstructure has been designed to be supported by cast-in-drilled-hole concrete piles and cast in place concrete columns. The new bridge will be raised approximately seven feet to meet hydraulic standards with 500 linear feet of roadway approach work to improve the roadway alignment and horizontal curve. Other work items included in the project include bridge removal, utility relocation, cast in place retaining wall, decorative bridge rail, rock slope protection and improvements to the Iron Horse Trial and Floodplain access roads.