CNRFC - Hydrology - Observed River/Reservoir Conditions

End of River Group

GUADALUPE RIVER - SAN JOSE AT ALMADEN EXPRESSWAY (GUDC1)

Latitude: 37.28º N	Longitude: 121.88º W	Elevation: 150 Feet
Location: Santa Clara County in California		Bulletin Group: Central Coast		River Group: South Bay

Action/Monitor: 9.0 Feet

Minor Flood: 10.5 Feet

Moderate Flood: 11.5 Feet

Major Flood: 15.0 Feet

Plot Type:

Observed Data Credit
	Raw streamflow data is provided by the Santa Clara Valley Water District. View Santa Clara Valley Water District Data for this station location.

Historical Mean Daily Stage/Flow Data
Water Year	Peak Discharge (cfs)	Stage (feet)	Date
Most Recent 5 Years
2025*	1,017	5.56	Feb 14, 2025
2024*	1,611	7.39	Feb 4, 2024
2023*	3,120	9.04	Jan 9, 2023
2022*	1,510	6.14	Dec 24, 2022
2021*	1,480	6.09	Jan 27, 2021
Historical High Stage/Flow Events (Period of Record - Jan 1975 to Present) - Ranked by Flow
1995*	8,470	11.73	Jan 09, 1995
1999*	6,780	10.50	Dec 3, 1998
* Discharge affected by regulation or diversion

Location Photographs
Upstream Photo	Gage House Photo	Downstream Photo

ESRI™ Locator Map

Flood Impacts
17.01 Feet	Cont'...Possible overtopping of Guadalupe River near Capitol Expwy on the east side, flowing towards Pearl Ave. Additionally, possible overtopping near Thousand Oaks Park and upstream of Branham Lane flowing along streets flooding businesses and the Erickson Neighborhood. If flood is sustained or incresing, car dealerships along Capitol Expwy may be inundated as well. Potential flooding on Ross and Canoas Creeks due to high backwater caused by Guadalupe River.
17.0 Feet	Washington/Guadalupe, Tamien and Alma/Almaden Neighborhoods east of CA-87 inundated from floodwaters traveling under street viaducts from the west. Widespread flooding in the eastern Willow Glen Neighborhood, as well as the Gardner and Atlanta/Bird Neighborhoods. CA87/I-280 interchange at risk from overland flow spilling onto the roadway.
15.0 Feet	Major Flood Stage. Flooding continues to spill near Alam 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 CA87. The Willow Glen Neighborhood bounded by Willow Street and Minnesota Avenue see 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.
11.73 Feet	Historical High Water - January 1995
11.5 Feet	Moderate Flood Stage. 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.
10.5 Feet	Minor Flood Stage. 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.
9.0 Feet	Monitor Stage. Additional flow from Canoas Creek watershed or increased reservoir spills may bring river to flood stage.

Official 7 Day National Weather Service Forecast (CAZ513)

rest of Tonight: Rain. Lows in the mid 50s. Southeast winds 5 to 10 mph.

Sunday: Rain in the morning, then a chance of rain in the afternoon. Highs in the lower 60s. South winds 5 to 15 mph.

Sunday Night: A chance of rain in the evening, then showers and a slight chance of thunderstorms after midnight. Lows around 50. Southeast winds 10 to 20 mph.

Monday: Rain in the morning, then a chance of rain in the afternoon. Highs in the upper 50s. Southwest winds 5 to 15 mph.

Monday Night: Mostly cloudy. A chance of rain in the evening, then a slight chance of rain after midnight. Lows in the mid 40s. West winds 5 to 10 mph and becoming north after midnight. Chance of rain 40 percent.

Tuesday: Mostly cloudy in the morning then becoming partly cloudy. Highs in the lower 60s.

Tuesday Night and Wednesday: Partly cloudy. Lows in the mid 40s. Highs in the lower 60s.

Wednesday Night and Thursday: Mostly cloudy. A chance of rain. Lows in the upper 40s. Highs around 60.

Thursday Night: Partly cloudy. A slight chance of rain. Lows in the mid 40s.

Friday: Partly cloudy. Highs in the mid 60s.

Friday Night and Saturday: Mostly clear. Lows in the mid 40s. Highs in the mid 60s.

Product Disclaimer

This river graphic is not intended to serve as a substitute for official flood watches, warnings, advisories, or statements issued by the NWS San Francisco Bay Area-Monterey Weather Forecast Office. Observations are preliminary and subject to change. River levels identified as "forecast" should be consistent with those contained in official NWS products. River levels identified as "guidance" have significant uncertainty due to future weather or reservoir regulation and are provided for planning purposes only.

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