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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 above Almaden Expwy

Reading 2.34 ft and 1.86 cfs. That is 6.66 feet below the first flood threshold.

Guadalupe River above Almaden Expwy plotted at latitude 37.2808 and longitude -121.8800 over Valley Water's published major-watershed layer.
Guadalupe River above Almaden Expwy at 37.2808, -121.8800, 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

2.34 ft

Captured July 28, 2026 at 4:30 PM PT

  • Sensor ID 5023_2
  • 37.2808, -121.8800
  • Included in Valley Water's flood watch, carries a forecast model
  • Reporting

What Floods at Each Level

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

Threshold 1 · 9 ft (3,762 cfs)

6.66 ft above the current reading

Flood Watch. Additional flow from Canoas Creek watershed or increased reservoir spills may bring river to flood stage.

Valley Water, threshold 1 description for Guadalupe River above Almaden Expwy

Threshold 2 · 10.5 ft (5,060 cfs)

8.16 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 above Almaden Expwy

Threshold 3 · 11 ft (5,509 cfs)

8.66 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 south of the old UPRR alignment in the Northern Cross Neighborhood also at risk.

Valley Water, threshold 3 description for Guadalupe River above Almaden Expwy

Threshold 4 · 12 ft (6,407 cfs)

9.66 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 above Almaden Expwy

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 operated for water rights, water supply, flood protection, operations and environmental monitoring. Vegetation downstream of the control may affect readings. Flow ratings are considered good. The USGS operated this sensor between October 2007 and September 2011 under ID 11167800.

Valley Water, sensor notes for Guadalupe River above Almaden Expwy