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

Surface Water Data Portal

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

Guadalupe watershed

Masson Fish Ladder

Reading 3.56 ft and 0 cfs. Valley Water publishes no flood threshold for this location.

Masson Fish Ladder plotted at latitude 37.2332 and longitude -121.8990 over Valley Water's published major-watershed layer.
Masson Fish Ladder at 37.2332, -121.8990, 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

3.56 ft

Captured July 28, 2026 at 4:30 PM PT

  • Sensor ID 5114
  • 37.2332, -121.8990
  • 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

Record should be considered fair. At flows exceeding approximately 7.5cfs, a substantial amount of water passes over the dam rather than through the fish ladder. For this reason, flow is not calculated above 7.5 cfs and the site is appropriate for measuring low flows only.

Valley Water, sensor notes for Masson Fish Ladder