National Weather Service California Nevada River Forecast Center Department of Commerce National Oceanic and Atmospheric Administration National Weather Service

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SAN JOAQUIN RIVER - PATTERSON (PATC1)
Latitude: 37.49º NLongitude: 121.08º WElevation: 97 Feet
Location: Stanislaus County in CaliforniaRiver Group: San Joaquin
Monitor Stage: 48.0 FeetFlood Stage: 54.7 FeetDanger Stage: 55.7 Feet

Observed Data Credit
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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
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
2019
11,800
45.31
Jun 5, 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
ESRI™ Locator Map
Official 7 Day National Weather Service Forecast   (CAZ019)
Tonight: Clear. Areas of frost late in the night. Colder. Lows 28 to 38. Northwest winds 10 to 15 mph with gusts to around 25 mph.

Sunday: Widespread frost in the morning. Sunny. Highs 50 to 57. Northwest winds up to 10 mph with gusts to around 20 mph.

Sunday Night: Clear. Areas of frost after midnight. Lows 28 to 36. Northwest winds up to 10 mph with gusts to around 20 mph.

Monday: Widespread frost in the morning. Mostly sunny. Highs 52 to 58. Northwest winds up to 10 mph.

Monday Night: Partly cloudy. Areas of frost after midnight. Lows 29 to 37. Northwest winds up to 10 mph.

Tuesday: Mostly sunny. Areas of frost. Highs 51 to 58.

Tuesday Night: Mostly cloudy with a chance of rain showers. Lows 36 to 42.

Wednesday and Wednesday Night: Rain showers. Highs 48 to 55. Lows 37 to 47.

Thursday and Thursday Night: Rain showers. Highs 52 to 59. Lows 42 to 49.

Friday: Mostly cloudy with rain showers likely. Highs 52 to 59.

Friday Night: Partly cloudy with a slight chance of rain showers. Lows 39 to 45.

Saturday: Mostly cloudy. Highs 54 to 60.
Flood Impacts
58.3 FeetStages 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.