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)

Tonight: Mostly cloudy in the evening then becoming partly cloudy. Patchy fog and frost late in the night. Lows 32 to 42. Northwest winds up to 10 mph.

Monday: Areas of frost and patchy fog in the morning. Mostly sunny. Highs 56 to 62. Northwest winds up to 10 mph.

Monday Night: Mostly clear. Patchy fog after midnight. Lows 34 to 44. Light winds.

Tuesday: Patchy fog and frost in the morning. Mostly sunny. Highs 55 to 61. Northwest winds up to 10 mph.

Tuesday Night: Clear. Patchy fog after midnight. Lows 32 to 42. Northwest winds up to 10 mph in the evening becoming light.

Wednesday: Mostly sunny. Patchy frost. Highs 57 to 63.

Wednesday Night: Partly cloudy. Lows 35 to 45.

Thursday and Thursday Night: Mostly cloudy. Highs 58 to 64. Lows 35 to 45.

Friday: Partly cloudy. Highs 59 to 65.

Friday Night: Mostly cloudy. Lows 35 to 45.

Saturday: Mostly sunny. Highs 60 to 66.

Saturday Night: Partly cloudy with a slight chance of rain showers. Lows 37 to 47.

Sunday: Partly cloudy with a slight chance of rain showers. Highs 58 to 64.

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.

NWS RSS Feed