Cook Riolo Bridge Replacement | Placer County, CA

Placer County


Construction Management
Structure Representative
Resident Engineering
SWPPP and Biological Mitigation and Monitoring


CMAA - Project Achievement Award

Replacing a Deficient 1930’s Bridge

The existing 1930’s bridge on Cook Riolo Road that spans Dry Creek in western Placer County was classified as both functionally obsolete and structurally deficient by Caltrans. The new $7.9 million three-span, post-tensioned, box girder replacement bridge was built through a two-season, multiple-stage construction process. The bridge was raised, lengthened, and widened to meet current standards.

Full construction management and inspection services were provided, including structure representative, resident engineering, and office support. Work involved removal of the existing bridge; construction of new mechanically stabilized embankment walls; installation of new, and improvements to existing, drainage facilities; and relocation of several utilities.

The project was challenged with numerous environmental and biological restrictions, including a spawning salmon habitat, Swainson hawks, and flaking lead-based paint. Dry Creek is a designated salmon habitat which required permit compliance with the Department of Fish and Game, Water Resources Board, and Central Valley Flood Protection Board.

The completion of the new Cook Riolo Bridge provides enhanced safety for vehicular traffic, bicyclists, and pedestrians, as well as protects the precious ecosystems of the area.