Nicasio Reservoir is a shallow, man-made reservoir in the Nicasio Valley region of Marin County, California, United States. It covers and sits in a drainage basin. It was created by the construction of Seeger Dam on the Nicasio Creek in 1961. Seeger Dam is a tall, long earthen dam owned by the Marin Municipal Water District (MMWD).
The construction in the dam aroused much controversy among longtime residents of the area. The Marin Municipal Water District forced the displacement of many farm, including the McIsaac family farm and the Tomasini Ranch, on which the majority of the reservoir sits.
The controversy stems from for four main reasons: One,water from the reservoir is rarely used by the MMWD.Two, the broad shallow nature of the reservoir leads to quick evaporation.Three, the dam has blocked valuable spawning areas for endangered species of salmon and steelhead. The water being considered a "back-up" source for times of severe drought (1975-1977, and therefore rarely used e (from [www.wikipedia.org](http://www.wikipedia.org/wiki/Nicasio_Reservoir).