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Surface Water Data Portal

Demo snapshot · July 28, 2026 at 4:53 PM PT · not current conditions

Reservoirs

Anderson Reservoir

Holding 3,508 acre-feet, which is 3.9 percent of its published capacity of 89,073 acre-feet.

Anderson Reservoir plotted at latitude 37.1659 and longitude -121.6280 over Valley Water's published major-watershed layer.
Anderson Reservoir at 37.1659, -121.6280, exactly as positioned in Valley Water's sensor feed. Coyote is the published polygon whose name matches this portal group. The eleven published polygons do not exactly match the portal's five sensor groups and do not provide a boundary for every named creek.
  • Reservoir

3.9%

  • Storage 3,508 acre-feet
  • Water surface elevation 489.3 ft
  • Spills at 625 ft
  • Coyote watershed
  • Captured July 28, 2026 at 4:30 PM PT

Why this reservoir reads differently

A creek through the lakebed

Anderson has been held far below capacity under a federal seismic order since 2020. This March 2024 photograph shows Coyote Creek crossing the exposed upper lakebed; it documents the restriction, not today's water level.

Coyote Creek flowing through the exposed upper Anderson Lake bed in March 2024
Upper Anderson Lake, March 2024. Photo: ECTran71 / CC BY-SA 4.0.

Reservoir Notes

Elevation data is in 'local' datum, which is similar, but not exactly, in NGVD29 datum. To convert the local datum to NAVD88, add 2.94'.

Valley Water, sensor notes for Anderson Reservoir