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Nicasio Reservoir
Nicasio Reservoir in Marin County California.jpg
Nicasio Reservoir seen from Nicasio Valley Road
Location of Nicasio Reservoir in California, USA.
Location of Nicasio Reservoir in California, USA.
Nicasio Reservoir
Location in California
Location of Nicasio Reservoir in California, USA.
Location of Nicasio Reservoir in California, USA.
Nicasio Reservoir
Location in the United States
Location Marin County, California
Coordinates 38°04′36″N 122°45′16″W / 38.07667°N 122.75444°W / 38.07667; -122.75444
Type reservoir
Primary inflows Nicasio Creek
Primary outflows Nicasio Creek
Basin countries United States
Surface area 845 acres (3.42 km2)
Water volume 22,400 acre⋅ft (27,600,000 m3)
Surface elevation 144 ft (44 m)
Settlements Nicasio, California
Nicasio Reservoir aerial
Nicasio Reservoir aerial, 2012

Nicasio Reservoir is a shallow, artificial 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.

Ecology

A river otter (Lontra canadensis) was collected by the Museum of Vertebrate Zoology at the southwest corner of Nicasio Reservoir in January, 2008.

Recreational uses

The reservoir is used for recreational purposes; mainly fishing and hiking. Largemouth bass, carp and catfish are caught in the lake. There are problems with illegal poaching.

The California Office of Environmental Health Hazard Assessment (OEHHA) has developed a safe eating advisory for fish caught in Nicasio Reservoir based on levels of mercury or PCBs found in the fish species.

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