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Surface Water Data Portal

Demo snapshot · July 28, 2026 at 4:53 PM PT · 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. Guadalupe River 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

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