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		River Group: San Joaquin

Monitor Stage: 48.0 Feet

Flood Stage: 54.7 Feet

Danger Stage: 55.7 Feet

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

Official 7 Day National Weather Service Forecast (CAZ019)

Today: Sunny. Highs 71 to 81. Northwest winds 10 to 20 mph. Gusts up to 40 mph decreasing to 30 mph in the afternoon.

Tonight: Clear. Lows 48 to 58. Northwest winds 10 to 15 mph with gusts to around 30 mph.

Thursday: Sunny. Highs 73 to 83. Northwest winds 10 to 20 mph with gusts to around 35 mph.

Thursday Night: Clear. Lows 50 to 58. Northwest winds 10 to 15 mph with gusts to around 25 mph.

Friday: Sunny. Highs 75 to 84. Northwest winds 10 to 15 mph.

Friday Night: Mostly clear. Lows 52 to 58.

Saturday: Mostly cloudy with rain showers likely. Cooler. Highs 57 to 66.

Saturday Night: Partly cloudy with a slight chance of rain showers. Colder. Lows 41 to 47.

Sunday: Mostly sunny. Highs 58 to 68.

Sunday Night and Monday: Clear. Lows 41 to 47. Highs 62 to 72.

Monday Night and Tuesday: Mostly clear. Lows 45 to 51. Highs 67 to 77.

Impacts - E19 Information
58.3 Feet	Stages above 58.3 feet result in flooding outside the levee. Top of levee.

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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