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 CaliforniaBulletin Group: San JoaquinRiver 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
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
ESRI™ Locator Map
Impacts - E19 Information
58.3 FeetStages above 58.3 feet result in flooding outside the levee. Top of levee.
Official 7 Day National Weather Service Forecast   (CAZ019)
Today: Breezy. A slight chance of thunderstorms in the morning. Rain showers through the day. A chance of thunderstorms early in the afternoon, then a slight chance of thunderstorms late in the afternoon. Highs 47 to 56. Southwest winds 10 to 25 mph with gusts to around 35 mph.

Tonight: Rain showers and a slight chance of thunderstorms in the evening, then rain showers likely after midnight. Breezy. Lows 37 to 43. South winds 15 to 25 mph shifting to the southwest 10 to 15 mph after midnight. Gusts up to 35 mph.

Sunday: Mostly cloudy with a chance of rain showers. Highs 49 to 58. South winds 10 to 15 mph.

Sunday Night: Mostly cloudy with a slight chance of rain showers. Lows 37 to 43. South winds 10 to 15 mph.

Monday: Mostly cloudy with a slight chance of rain showers. Highs 52 to 60. Southeast winds 10 to 15 mph.

Monday Night: Mostly cloudy with a chance of rain showers. Lows 43 to 49.

Tuesday: Mostly cloudy with a chance of rain showers. Highs 53 to 62.

Tuesday Night: Mostly cloudy with a chance of rain showers. Lows 43 to 48.

Wednesday: Mostly cloudy with a slight chance of rain showers. Highs 53 to 62.

Wednesday Night: Partly cloudy with a slight chance of rain showers. Lows 37 to 43.

Thursday: Mostly sunny. Highs 56 to 65.

Thursday Night and Friday: Clear. Lows 36 to 42. Highs 59 to 67.
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.