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Nicasio Reservoir is a shallow, man-made reservoir in the Nicasio Valley region of Marin County, California, United States. It covers 845 acres (3.42 km2) and sits in a 35.9 square miles (93 km2) drainage basin. It was created by the construction of Seeger Dam on the Nicasio Creek in 1961. Seeger Dam is a 115-foot (35 m) tall, 400-foot (120 m) long earthen dam owned by the Marin Municipal Water District (MMWD).[1]