CASE STUDY
Salmon Habitat Enhancement and Bridge Replacement at Muir Woods National Monument
Project Summary
The Salmon Habitat Enhancement and Bridge Replacement Project at Muir Woods National Monument enhanced salmonid habitat in Redwood Creek by placing instream large woody debris and removing existing rock armoring (riprap) along the banks to restore natural channel processes. The project also involved upgrading and replacing four aging pedestrian bridges that span the creek. This initiative was led by the Golden Gate National Parks Conservancy, in conjunction with the National Park Service, Golden Gate National Recreation Area, and California Department of Parks and Recreation.
Our Role
Montrose (Formerly Horizon Water and Environment) played a crucial role in ensuring the project’s compliance with the National Environmental Policy Act (NEPA) by:
- Preparing an Environmental Assessment/Finding of No Significant Impact (EA/FONSI).
- Conducting technical studies and reports to assess sensitive resources, including wetland delineation, riprap condition assessment, and archaeological surveys.
Challenges
During the project planning and development phase, we addressed several key issues, including:
- Evaluating potential short- and long-term effects on sensitive resources and the visitor experience.
- Assessing impacts on aquatic, riparian, and old-growth redwood forest habitats.
- Considering effects on groundwater resources and special-status plant and wildlife species, such as coho salmon, steelhead, northern spotted owl, and marbled murrelet.
- Protecting Native American resources and historic park structures constructed during the Civilian Conservation Corps era.
Outcome
The project successfully balanced the enhancement of salmonid habitat with preserving the visitor experience and protection of sensitive resources. Our comprehensive approach ensured that the project met regulatory requirements and contributed to the long-term sustainability of the Muir Woods National Monument ecosystem.
