The “San Geronimo Floodplain and Riparian Restoration” project has occurred upstream of the Roy’s Pools Fish Passage and Floodplain Restoration site and focuses on addressing limiting factors for coho survival, improving water quality and riparian function, and improving conditions for floodplain and off-channel habitat development. 

In total, this project will restore 0.25 miles and 5 acres of the floodplain corridor along the former San Geronimo golf course property in San Geronimo, California. A primary feature of this project is creating off-channel habitat, these include creation of secondary channels and floodplains that offer coho salmon rearing and food resources during high storms and spring rearing. Floodplains also offer chances for sediment sorting and storage, pool scour, helping improve spawning habitat and instream gravel quality. This project also creates valuable floodplain corridors for terrestrial wildlife movement, greatly increasing the width of the riparian corridor, which will ultimately increase amount of trees for nesting birds and foraging animals. 

This project was funded by the California Department of Fish and Wildlife, NOAA Restoration Center, and Turtle Island Restoration Network. Project engineering and design was done by Environmental Science Associates, and project construction was done by Hanford ARC and SPAWN. The Landowner, The Trust for Public Land, has been a great willing partner.

Project Impact


Acres of creekside habitat restored


Native plants and trees planted


Feet of streamside habitat restored

Project Background

This project built off the Roy’s Pools Fish Passage and Floodplain Restoration Project downstream and developed as a project to create opportunity for the creek to have more room to move, adapt, and respond to different watershed conditions. The former landowners, the Lee Family, were incredibly helpful in allowing the project to get started, and the current landowner, the Trust for Public Land, was an excellent partner in seeing the project come to fruition. 

From Roy’s Dam to Roy’s Riffles

Removing the Top-Priority Barrier

for Central California Coho Salmon

Read the Article

Project Timeline

The earthwork was completed in October 2021. Revegetation, site maintenance, and restoration monitoring is ongoing by SPAWN.

Project Updates & Resources


Critically Endangered Coho Salmon Return to Bay Area to SPAWN

For Immediate Release: November 10, 2022 Contact: Ayano Hayes, Watershed Biologist, (916) 216-8355‬, Todd…

SPAWN hires local artist to design new Interpretive Sign for Roy’s Riffles Restoration Project

  For Immediate Release: June 30, 2022 Contact: Preston Brown, (303) 877-0880, Olema, Calif.…

Update on Roy’s Riffles Restoration Site

Over the last several weeks, the floodplains and graded slopes that were shaped and sculpted…

Volunteer Gallery: March 2022

SPAWN holds volunteer events throughout the year, and here are images from a recent outing!…