BKF was selected by the Contra Costa Transportation Authority (CCTA) and the City of San Ramon to provide construction management services during the project delivery of the Iron Horse Trail/Bollinger Canyon Road Bicycle and Pedestrian Overcrossing, with CCTA serving as the implementing agency and the City as the project sponsor. The project constructed a bicycle and pedestrian overcrossing at Bollinger Canyon Road as part of the Iron Horse Trail.
The project enhanced safety for pedestrians and bicyclists using the trail, improved traffic flow on Bollinger Canyon Road, facilitated alternative transportation, and enhanced recreational access. The Iron Horse Trail is a Route of Regional Significance, serving as a bicycle and pedestrian corridor through the San Ramon Valley, extending from Dublin to Martinez and connecting key destinations including schools, City Hall, parks, transit, and commercial centers.
The overcrossing structure consists of cable-stayed main spans totaling 200 feet in length, supported by a 70-foot-tall V-shaped pylon. The structural steel pylon is supported by a concrete pile cap and two 72-inch diameter CIDH piles approximately 78 feet long. The main and back spans were constructed of structural steel with precast concrete deck panels. Back spans are supported by concrete V-piers with 48-inch diameter CIDH piles approximately 40 feet in length. Concrete abutments on spread footings and mechanically stabilized earth retaining walls were used for the approaches. Additional improvements included utility protection, roadway realignment, signing and striping, traffic signals, lighting, landscaping, and irrigation.
BKF provided pre-construction services, including coordination with CCTA, the City, the CM/GC contractor, and the design team on construction cost and contract documents. BKF also provided full construction management and administration services during construction and project closeout.
