Bridge Projects

  • arroyo-mocho-1arroyo-mocho-2

    The Arroyo Mocho Creek Crossing is located in the lower end of the Arroyo Mocho Canyon in Livermore, California. A concrete ford creek crossing was constructed across the stream at the Arroyo Mocho Shaft Road and was used by the Lawrence Livermore National Laboratories to access the Arroyo Mocho Pump Station, the primary water supply for the laboratories. The creek crossing was a complete barrier to both steelhead and resident trout migration. FCE led a multi-disciplinary team of engineers, biologists, geomorphologists and hydrologists to develop restoration plans and specifications for a clear span bridge. The project involved the development of a biological assessment, a geomorphic assessment and hydraulic analysis and preparation of engineering design plans and specifications for the restoration of the stream, the removal of the concrete ford, and the design of a new clear span steel truss bridge to provide year round access to the pump station. The project entailed the removal of the concrete ford, the reshaping of the stream channel, the installation of an 80 foot clear span bridge and concrete abutments, and the restoration of approximately 190 lineal feet of channel upstream of the crossing to establish a new stream grade and alignment. The newly restored reach included 4 vortex boulder weirs constructed to provide year round fish passage and grade control.

  • tucker-road-1

    The West Branch of Soquel Creek supports the federally threatened steelhead trout (Oncorhynchus mykiss) and historically supported the federally and state endangered coho salmon (Oncorhynchus kisutch). Tucker Road Ford was a concrete ford that was a barrier to fish passage and the purpose of the project was to improve fish passage by removing the concrete ford, reshaping the stream channel to improve habitat, and install a clear span bridge to provide year round access to residential parcels. Fall Creek Engineering, Inc. (FCE) led a multi-disciplinary team of engineers, hydrologist, geomorphologics and biologist to restore the creek and install a clear span bridge. The ford was replaced by a 120-foot span bridge designed to pass the 100-year flood event. Approximately 215 feet of the channel upstream of the ford was reshaped to a 3% slope to form and restore a stable stream bed and the former channel morphology.

  • tom-kat-1tom-kat-2

    Tomkat Ranch is a privately owned horse ranch, located in Pescadero, California. Honsinger Creek, which runs through the property, is a major tributary to Pescadero Creek, on the Central California Coast in San Mateo County. Honsinger Creek supports federally threatened steelhead trout (Oncorhynchus mykiss) and the federally and state endangered coho salmon (Oncorhynchus kisutch). Approximately 0.5 miles upstream of the confluence of Honsinger Creek and Pescadero Creek, on Tomkat Ranch, a perched culvert on the creek restricted passage of both steelhead and salmon. The perched culvert did not allow winter passage of fish, upstream to several miles of intact spawning and rearing habitat. The primary purpose of the project was to remove the perched culvert on Honsinger Creek and replace the culvert with a clear span bridge. FCE designed a new clear span bridge to replace the culvert. The constructed bridge is a 16-foot wide and 70-foot long pre-fabricated steel truss bridge. The new bridge is supported by two concrete abutments that were constructed outside the riparian corridor and above the normal high water or bankfull level.

  • frenchmans-creek-1frenchmans-creek-2

    Frenchmen’s Creek is a perennial coastal stream located in Half Moon Bay on the Central Coast of California. The stream is approximately 4.1 miles long and drains directly to the Pacific Ocean. The stream and riparian corridor are relatively undisturbed and intact, providing good habitat for coast steelhead and other riparian wildlife. In the early 1970's the landowner installed a six-foot diameter by 42-foot long culvert to provide a farm road crossing across the creek. Over time, the culvert become perched, and the invert elevation of the culvert outlet was approximately nine feet above the bed of the channel. The condition created a barrier to the passage of both juvenile and adult steelhead and did not allow fish to access the upper one and half mile of stream course. FCE led a multi-disciplinary team of engineers, scientist and biologist to remove the culvert and restore the stream for juvenile and adult fish passage. The perched culvert was replaced with a 65 long railcar bridge. The project included several biotechnical stream channel and bank stabilization measures to restore the channel to a stable, non-eroding condition. Eight one-foot high boulder step-pool weirs were installed to provide grade control and facilitate step-pool formation to enhance fish passage and habitat in the project reach. The proposed project also included installing channel toe and bank stabilization measures, such as vegetated riprap. Lastly, the project included post-construction erosion control measures and revegetation of the site with native riparian and upland plants.

  • mission-springs-1

    Fall Creek in association with Streeter Group and Bauldry Engineering completed the design and oversaw the construction of a new bridge crossing Lockhart Gulch Creek. This Bridge is a main entrance to the conference center and community. The Tabernacle Bridge is 60 feet long and 20 feet wide and is supported by concrete reinforced piers, drilled into the sandstone bedrock. A concrete grade beam was installed on the piers and formed to set the bridge in place. The bridge is a prefabricated all-weather steel truss type bridge manufactured by CONTECH Steadfast Bridge Division.

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