CNRFC - Hydrology - Observed River/Reservoir Conditions

SAN JOAQUIN RIVER - PATTERSON (PATC1)

Latitude: 37.49º N	Longitude: 121.08º W	Elevation: 97 Feet
Location: Stanislaus County in California		Bulletin Group: San Joaquin		River Group: San Joaquin

Action/Monitor: 48.0 Feet

Minor Flood: 54.7 Feet

Moderate Flood: 57.3 Feet

Major Flood: 58.3 Feet

Plot Type:

Observed Data Credit
	Raw streamflow data is provided by the California Department of Water Resources. View California Department of Water Resources Data for this station location.

Historical Stage/Flow Data
Water Year	Peak Discharge (cfs)	Stage (feet)	Date
Most Recent 5 Years
2024	5,740	41.64	Mar 7, 2024
2023	24,500	52.24	Mar 27, 2023
2022	1,190	33.41	Dec 31, 2021
2021	1,770	34.50	Feb 1, 2021
2020	3,120	37.40	Oct 2, 2019
Historical High Stage/Flow Events (Period of Record - Oct 1969 to Present) - Ranked by Flow
1983*	28,700	51.26	Mar 4, 1983
2006*	27,612	50.97	Apr 10, 2006
2017	25,600	51.71	Feb 22, 2017
1980*	24,900	50.57	Feb 25, 1980
2023	24,500	52.24	Mar 27, 2023
1938*	--	50.50	Jun 13, 1938
1986*	23,000	49.65	Mar 18, 1986

* Discharge affected by regulation or diversion
** Most recent continuous record back to Oct 1969 with segmented periods back to Apr 1938

Location Photographs
Upstream Photo	Gage House Photo	Downstream Photo

ESRI™ Locator Map

Flood Impacts
58.3 Feet	Stages above 58.3 feet result in flooding outside the levee. Top of levee.

Official 7 Day National Weather Service Forecast (CAZ019)

Tonight: Mostly clear. Lows 45 to 51. West winds up to 15 mph with gusts to around 25 mph.

Tuesday: Partly cloudy in the morning then clearing. Highs 64 to 74. Northwest winds up to 15 mph. Gusts up to 25 mph in the afternoon.

Tuesday Night: Clear. Lows 46 to 52. Northwest winds up to 15 mph. Gusts up to 25 mph in the evening.

Wednesday: Sunny, warmer. Highs 74 to 82. Northwest winds up to 10 mph. Gusts up to 20 mph in the afternoon.

Wednesday Night: Clear. Lows 49 to 55. Northwest winds up to 15 mph.

Thursday: Sunny. Highs 79 to 87.

Thursday Night: Partly cloudy. Lows 53 to 59.

Friday: Partly cloudy. Highs 79 to 89.

Friday Night through Sunday: Mostly clear. Lows 48 to 58. Highs 76 to 86.

Sunday Night and Monday: Clear. Lows 50 to 58. Highs 77 to 87.

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 Sacramento 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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