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Surface Water Data Portal

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

Reservoirs

Calero Reservoir

Holding 3,974 acre-feet, which is 40.0 percent of its published capacity of 9,934 acre-feet.

Calero Reservoir plotted at latitude 37.1821 and longitude -121.7920 over Valley Water's published major-watershed layer.
Calero Reservoir at 37.1821, -121.7920, 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

40.0%

  • Storage 3,974 acre-feet
  • Water surface elevation 461.9 ft
  • Spills at 483.5 ft
  • Guadalupe watershed
  • Captured July 28, 2026 at 4:30 PM PT

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 2.40'.

Valley Water, sensor notes for Calero Reservoir

Gauges Below This Reservoir

  1. Calero Creek below Calero Reservoir

    1.39 ft · 0.8 cfs · 2.41 ft below threshold 1