Marin County Residents Worried Town Will Flood If Creek Isn't Dredged

CBS Bay Area

October 20, 2026

The towns along Marin County's waterfront are doing what they can to prepare for what are predicted to be record-high tides this winter. But farther inland, the tiny community of Nicasio has flooding worries of its own, and they say an action 65 years ago by the local water district is to blame for it.

Nicasio Reservoir was built in 1961 and is an important asset of the Marin Municipal Water District. But ever since it was built, it's been having a dampening effect on the town of Nicasio. The town now worries about flooding anytime an "atmospheric river" is forecasted.

"This is output from our flood model that shows what would happen if you were to have a hundred-year flood," said contract hydrologist Andy Collison during a report last month to the district. "Large areas are inundated, including Nicasio Elementary School and also some private residences and businesses down there."

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