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Surface Water Data Portal

Demo snapshot · July 28, 2026 at 4:53 PM PT · not current conditions

Guadalupe watershed

Alviso Slough

Reading 4.90 ft and 0 cfs. Valley Water publishes no flood threshold for this location.

Alviso Slough plotted at latitude 37.4369 and longitude -121.9911 over Valley Water's published major-watershed layer.
Alviso Slough at 37.4369, -121.9911, 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.
  • Stream gauge

4.90 ft

Captured July 28, 2026 at 4:30 PM PT

  • Sensor ID 5159
  • 37.4369, -121.9911
  • Not a flood watch sensor
  • Reporting

Flood Thresholds

Valley Water publishes no flood thresholds for this sensor. It is monitored for water supply and stream conditions rather than for flood warning.

Sensor Notes

Stage only. Measurements began in November of 2021.

Valley Water, sensor notes for Alviso Slough