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

Monitor Stage: 48.0 Feet

Flood Stage: 54.7 Feet

Danger Stage: 55.7 Feet

Plot Type:

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

Historical Stage/Flow Data
Water Year	Peak Discharge (cfs)	Stage (feet)	Date
Most Recent 5 Years
2022	1,190	33.41	Dec 31, 2021
2021	1,770	34.50	Feb 1, 2021
2020	3,120	37.40	Oct 2, 2019
2019	11,800	45.31	Jun 5, 2019
2018	4,600	39.68	Apr 12, 2018
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
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

Impacts - E19 Information
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: Clear. Lows 49 to 55. Northwest winds up to 15 mph with gusts to around 25 mph.

Thursday: Sunny. Highs 77 to 86. West winds up to 10 mph with gusts to around 20 mph.

Thursday Night: Clear. Lows 50 to 56. Northwest winds up to 15 mph with gusts to around 25 mph.

Friday: Sunny. Highs 81 to 89. Northwest winds up to 15 mph.

Friday Night: Clear. Lows 54 to 60. Northwest winds 10 to 15 mph.

Saturday: Sunny. Highs 85 to 93.

Saturday Night: Mostly clear. Lows 57 to 63.

Sunday: Mostly sunny. Highs 87 to 96.

Sunday Night through Monday Night: Partly cloudy. Lows 55 to 64. Highs 85 to 95.

Tuesday: Partly cloudy with a slight chance of rain showers. Highs 76 to 86.

Tuesday Night: Mostly cloudy. Lows 54 to 60.

Wednesday: Partly cloudy. Highs 75 to 84.

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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