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Surface Water Data Portal

Readings as of July 28, 2026 at 4:53 PM PT ยท not current conditions

Reservoirs

Almaden Reservoir

Holding 1,093 acre-feet, which is 68.9 percent of its published capacity of 1,586 acre-feet.

Almaden Reservoir plotted at latitude 37.1638 and longitude -121.8280 over Valley Water's published major-watershed layer.
Almaden Reservoir at 37.1638, -121.8280, exactly as positioned in Valley Water's sensor feed. Valley Water publishes Guadalupe River 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

68.9%

  • Storage 1,093 acre-feet
  • Water surface elevation 599.5 ft
  • Spills at 608.6 ft
  • Guadalupe watershed
  • Captured July 28, 2026 at 4:30 PM PT

Reservoir Notes

Elevation data is in NAVD88 datum. Prior to October 1st 1997, elevation data is in 'local' datum, which is similar, but not exactly, in NGVD29 datum. To convert the local datum to NAVD88, add 1.73'.

Valley Water, sensor notes for Almaden Reservoir