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Surface Water Data Portal

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

Guadalupe watershed

Guadalupe River at Alma Ave (Stage Only)

Reading 3.12 ft and 0 cfs. That is 11.38 feet below the first flood threshold.

Guadalupe River at Alma Ave (Stage Only) plotted at latitude 37.3093 and longitude -121.8850 over Valley Water's published major-watershed layer.
Guadalupe River at Alma Ave (Stage Only) at 37.3093, -121.8850, 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

3.12 ft

Captured July 28, 2026 at 4:30 PM PT

  • Sensor ID 5138
  • 37.3093, -121.8850
  • Included in Valley Water's flood watch
  • Reporting

What Floods at Each Level

These descriptions are Valley Water's own, quoted exactly as published for this gauge.

Threshold 1 · 14.5 ft (3,780 cfs)

11.38 ft above the current reading

Flood Watch. Increased vegetation growth and or debris may bring creek to flood stage.

Valley Water, threshold 1 description for Guadalupe River at Alma Ave (Stage Only)

Threshold 2 · 17.5 ft (5,400 cfs)

14.38 ft above the current reading

River begins to overtop upstream of Alma Avenue Bridge into the Elks Lodge, spilling north, as well as near the RxR on the east bank.

Valley Water, threshold 2 description for Guadalupe River at Alma Ave (Stage Only)

Threshold 3 · 18.5 ft (5,800 cfs)

15.38 ft above the current reading

River continues to overtop upstream of Alma Avenue Bridge into the Elks Lodge, spilling north along Lelong Street. Alma Avenue/CA87 viaduct is flooded. Creek overbanks west near Minnesota Avenue downstream of Alma Avenue. Properties upstream of the old UPRR alignment in the Northern Cross Neighborhood also at risk.

Valley Water, threshold 3 description for Guadalupe River at Alma Ave (Stage Only)

Threshold 4 · 19.5 ft (6,350 cfs)

16.38 ft above the current reading

Flooding continues to spill near Alma Avenue, flowing northward and crossing east under Willow Street and Alma Avenue viaducts, continuing to flow north. Overbanking occurs at Atlanta Avenue just upstream of CA-87. The Willow Glen Neighborhood bounded by Willow Street and Minnesota Avenue sees overland flooding. Overbanking occurs in various locations between Alma Avenue and Willow Glen Way. Potential flooding on Ross and Canoas creeks due to high backwater caused by Guadalupe River.

Valley Water, threshold 4 description for Guadalupe River at Alma Ave (Stage Only)

Places This Gauge Covers

Streets and landmarks named in the threshold descriptions above.

Upstream and Downstream

Where this gauge sits on Guadalupe River.

  1. Guadalupe River at Alamitos Fish Ladder

    1.60 ft · 5.8 cfs · no published threshold

  2. Guadalupe River above Almaden Expwy

    2.34 ft · 1.86 cfs · 6.66 ft below threshold 1

  3. Guadalupe River at Alma Ave (Stage Only)

    3.12 ft · 0 cfs · 11.38 ft below threshold 1

  4. Guadalupe River at US-101 (USGS)

    5.12 ft · 27.5 cfs · 11.88 ft below threshold 1

  5. Guadalupe River at Montague Expwy (Stage Only)

    10.44 ft · 0 cfs · no published threshold

  6. Guadalupe River at Gold St (Stage Only)

    4.76 ft · 0 cfs · no published threshold

Sensor Notes

Sensor is stage only for flood warning purposes.

Valley Water, sensor notes for Guadalupe River at Alma Ave (Stage Only)