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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 US-101 (USGS)

Reading 5.12 ft and 27.5 cfs. That is 11.88 feet below the first flood threshold.

Guadalupe River at US-101 (USGS) plotted at latitude 37.3735 and longitude -121.9330 over Valley Water's published major-watershed layer.
Guadalupe River at US-101 (USGS) at 37.3735, -121.9330, 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

5.12 ft

Captured July 28, 2026 at 4:30 PM PT

  • Sensor ID 5109, USGS 11169025
  • 37.3735, -121.9330
  • 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 · 17 ft (7,362 cfs)

11.88 ft above the current reading

Flood watch stage.

Valley Water, threshold 1 description for Guadalupe River at US-101 (USGS)

Threshold 2 · 19 ft (9,918 cfs)

13.88 ft above the current reading

High flows with heavy debris might cause localized blockages to cause overtopping of levees.

Valley Water, threshold 2 description for Guadalupe River at US-101 (USGS)

Threshold 3 · 20 ft (14,000 cfs)

14.88 ft above the current reading

Levee overtopping imminent. Highest risk areas are between US-101 and Trimble.

Valley Water, threshold 3 description for Guadalupe River at US-101 (USGS)

Threshold 4 · 21 ft (18,000 cfs)

15.88 ft above the current reading

Levee overtopping, with failures likely along both sides of the river between US-101 and Trimble flowing in a northerly direction.

Valley Water, threshold 4 description for Guadalupe River at US-101 (USGS)

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

This sensor is operated by the USGS. Previously, this sensor was located near St John Street in San Jose under USGS sensor ID 11169000. The captured contributing watershed is approximately the same.

Valley Water, sensor notes for Guadalupe River at US-101 (USGS)