The risk: Bothin Marsh sits at the edge of Mill Valley's flatlands, a natural flood buffer separating the city's lowest neighborhoods from San Francisco Bay. It is also one of the primary barriers standing between those neighborhoods and what sea level rise projections show is coming.
According to projections presented at the city's May 2026 Shoreline Adaptation Framework open house, a 4.9-foot inundation scenario puts Miller Avenue, Tamalpais High School, Mill Valley Middle School, the Community Center, Bayfront Park and Hauke Park underwater. At 6.6 feet, the flood boundary matches the historic tidelands of 1870.
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