Mad River Bridge Replacement Project Biological Monitoring During Construction

Categorized Under: Environment



The US 101 bridges over the Mad River are two of the many bridges maintained by Caltrans being replaced due to seismic deficiencies.  ICF assisted Caltrans with the evaluation, permitting, mitigation development, and agency negotiation for the project and is conducting the four-year construction monitoring program.

The Mad River supports three Endangered Species Act (ESA) listed salmonid species, which could potentially be present at the bridge site during pile driving for the project, one of the primary concerns to the resource agencies. ICF prepared the biological assessment and the mitigation and monitoring plans for the project and assisted Caltrans in negotiations with National Marine Fisheries Service, California Department of Fish and Game, and the California Coastal Commission.  ICF worked closely with Caltrans and the agencies to ensure that the project could be constructed on schedule, and minimize potential for delays.

The ICF team and our subconsultants have conducted a variety of construction monitoring activities during the construction of the southbound bridge, including snorkel surveys to determine salmonid distribution and abundance, removing fish from a fish exclusion zone, monitoring underwater sound during pile driving, conducting an in situ study on the effects of pile driving sound on juvenile steelhead, and monitoring of day-to-day construction for permit compliance throughout construction. The results of the pile driving effects study provide a rare look at the effects of underwater sound on fish pathology in situ.

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Insight Details

Client: California Department of Transportation (Caltrans)
Location: Near Arcata, CA

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