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
2019
11,800
45.31
Jun 5, 2019
2018
4,600
39.68
Apr 12, 2018
2017
25,600
51.71
Feb 22, 2017
2016
2,512
37.33
Mar 14, 2016
2015
1,477
34.52
Dec 16, 2014
 Historical High Stage/Flow Events (Period of Record - Oct 1969 to Present)
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: Partly cloudy in the morning then clearing. Patchy fog in the morning. Highs 63 to 71. West winds up to 10 mph.

Tonight: Mostly clear. Lows 40 to 50. Southwest winds up to 10 mph shifting to the west after midnight.

Sunday: Patchy fog in the morning. Mostly sunny. Highs around 67. Northwest winds up to 10 mph shifting to the southwest in the afternoon.

Sunday Night: Mostly clear. Lows 42 to 50. Southeast winds up to 10 mph shifting to the northwest after midnight.

Martin Luther King Jr Day: Mostly sunny. Windy. Highs 64 to 70. Northwest winds 15 to 20 mph increasing to 20 to 30 mph in the afternoon. Gusts up to 40 mph.

Monday Night: Clear, windy. Lows 41 to 49.

Tuesday: Sunny, windy. Highs 60 to 66.

Tuesday Night: Clear, colder. Lows 34 to 43.

Wednesday through Thursday Night: Mostly clear. Highs around 62. Lows 33 to 43.

Friday: Mostly sunny. Highs 52 to 57.
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.