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Surface Water Data Portal

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

Reservoirs

Vasona Reservoir

Holding 440 acre-feet, which is 110.1 percent of its published capacity of 400 acre-feet.

Vasona Reservoir plotted at latitude 37.2463 and longitude -121.9650 over Valley Water's published major-watershed layer.
Vasona Reservoir at 37.2463, -121.9650, 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

110.1%

  • Storage 440 acre-feet
  • Water surface elevation 294.4 ft
  • Spills at 294.8 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 2.47'.

Valley Water, sensor notes for Vasona Reservoir