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: Partly cloudy in the morning, then mostly cloudy with a slight chance of rain showers in the afternoon. Highs 57 to 65. Northwest winds up to 10 mph.

Tonight: Mostly cloudy. A slight chance of rain showers in the evening. Colder. Lows 37 to 43. West winds up to 10 mph with gusts to around 20 mph.

Tuesday: Mostly cloudy in the morning then clearing. Highs 55 to 63. Northwest winds 10 to 15 mph.

Tuesday Night: Clear. Lows 37 to 43. Northwest winds up to 15 mph.

Wednesday: Sunny. Highs 60 to 67. South winds up to 10 mph.

Wednesday Night: Mostly clear. Lows 40 to 46.

Thursday: Mostly cloudy with a slight chance of rain showers. Highs 55 to 65.

Thursday Night and Friday: Rain showers. Lows 46 to 51. Highs 51 to 61.

Friday Night: Rain showers. Breezy. Lows 39 to 44.

Saturday and Saturday Night: Rain showers. Highs 47 to 57. Lows 34 to 44.

Sunday: Mostly cloudy with a chance of rain showers. Highs 47 to 56.
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.