The San Geronimo Creek fish passage project improves fish passage through the 60-year-old culvert and improves fish habitat during low-flow drought conditions with the construction of deep pools created by log and rock structures to be installed along 365 feet of the channel downstream from Railroad Avenue. The San Geronimo Valley is the last undammed headwaters of Lagunitas Creek and is considered critical coho salmon spawning and juvenile rearing habitat. Over 8 fish passage barriers have been removed in San Geronimo. Learn More © Marin County Department of Public Works