New website by Stoa. Not the official Valley Water website.

Surface Water Data Portal

Readings as of July 28, 2026 at 4:53 PM PT ยท 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. Valley Water publishes Coyote as a major watershed here. The eleven published boundaries do not line up exactly with the five watershed groupings used here, and not every named creek has one.
  • 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