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
2016
2,512
37.33
Mar 14, 2016
2015
1,477
34.52
Dec 16, 2014
2014
1,357
32.80
Oct 28, 2013
2013
1,809
34.32
Dec 29, 2012
2012
1,984
35.10
Oct 13, 2011
 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
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. A slight chance of rain showers in the morning. Areas of fog in the morning. Highs around 60. Light winds.

Tonight: Partly cloudy in the evening then becoming mostly cloudy. Patchy fog after midnight. Lows 44 to 50. Light winds.

Wednesday: Mostly cloudy in the morning then becoming partly cloudy. Patchy fog in the morning. Highs around 61. Light winds.

Wednesday Night: Mostly cloudy. Lows around 47. Light winds.

Thursday: Mostly cloudy. A slight chance of rain in the morning, then a chance of rain in the afternoon. Highs 57 to 62. South winds up to 10 mph.

Thursday Night: Mostly cloudy with a chance of rain. Lows 42 to 48.

Friday: Mostly cloudy with a chance of rain showers. Highs 49 to 55.

Friday Night: Mostly cloudy with a chance of rain showers. Colder. Lows 32 to 40.

Saturday: Mostly sunny. Highs 49 to 54.

Saturday Night: Partly cloudy. Lows 33 to 41.

Sunday and Sunday Night: Mostly cloudy with a chance of rain. Highs 50 to 56. Lows 35 to 45.

Monday: Rain likely. Highs 51 to 56.
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.