New website by Stoa. Not the official Valley Water website.

Surface Water Data Portal

Readings as of July 28, 2026 at 4:53 PM PT ยท 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. 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.
  • 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