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
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
2017
25,600
51.71
Feb 22, 2017
 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
Official 7 Day National Weather Service Forecast   (CAZ019)
Today: Mostly cloudy in the morning then becoming mostly sunny. Highs 54 to 63. West winds around 10 mph.

Tonight: Mostly cloudy. A chance of rain showers after midnight. Lows 41 to 48. Southwest winds up to 10 mph shifting to the northeast around 10 mph after midnight.

Tuesday: Rain showers in the morning, then rain showers and a slight chance of thunderstorms in the afternoon. Breezy. Highs 48 to 57. Southeast winds 10 to 15 mph increasing to 15 to 25 mph in the afternoon. Gusts up to 40 mph.

Tuesday Night: Rain showers likely. Breezy. Lows around 44. Southeast winds 10 to 25 mph with gusts to around 35 mph.

Wednesday: Rain showers likely. Highs 51 to 59. Southeast winds 10 to 15 mph with gusts to around 25 mph.

Wednesday Night: Mostly cloudy with a slight chance of rain showers. Lows 40 to 46.

Thursday: Partly cloudy. Highs 54 to 62.

Thursday Night: Partly cloudy with a slight chance of rain showers. Lows around 41.

Friday and Friday Night: Mostly clear. Highs 54 to 61. Lows 35 to 41.

Saturday: Sunny. Highs 52 to 60.

Saturday Night and Sunday: Mostly clear. Lows 34 to 40. Highs 52 to 61.
Impacts - E19 Information
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.