Salmon Creek flows through rural Marin County for approximately 4.5 miles, originating at 800 feet elevation and flowing west along Hicks Valley Road and Marshall-Petaluma Road before meeting Arroyo Sausal to form Walker Creek. This tributary eventually empties into Tomales Bay and the Pacific Ocean. The creek drains a watershed predominantly used for ranching and agricultural purposes, with over 90% of the land privately owned. Historically recognized as important salmon and steelhead spawning and nursery habitat, the creek has faced significant challenges from poor farming practices, dairy pollution, and soil erosion over the years. Despite these impacts, ongoing restoration efforts have helped reintroduce threatened salmonid populations to the watershed.