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

 | 

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
Gage owner logo

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
2025* 3,590 37.63 Mar 22, 2025
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
 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
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. Lows 44 to 52. Light winds.

Saturday: Sunny, warmer. Highs 76 to 82. Northwest winds up to 10 mph.

Saturday Night: Partly cloudy. Lows 48 to 58. North winds up to 10 mph.

Sunday: Mostly sunny. Highs 79 to 85. North winds up to 10 mph.

Sunday Night: Mostly clear. Lows 49 to 55. Northwest winds up to 10 mph.

Monday: Sunny. Highs 76 to 82.

Monday Night: Clear. Lows 46 to 52.

Tuesday and Tuesday Night: Mostly clear. Highs 75 to 80. Lows 47 to 57.

Wednesday: Mostly cloudy with a chance of rain showers and a slight chance of thunderstorms. Highs 70 to 77.

Wednesday Night: Partly cloudy with a chance of rain. Lows 48 to 54.

Thursday: Mostly cloudy with a chance of rain showers and a slight chance of thunderstorms. Highs 66 to 74.

Thursday Night and Friday: Mostly clear. A slight chance of rain. Lows 46 to 52. Highs 66 to 74.
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.