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
2014
1,357
32.80
Oct 28, 2013
2013
1,809
34.32
Dec 29, 2012
2012
1,984
35.10
Oct 13, 2011
2011
23,269
49.63
Mar 31, 2011
2010
--
--
--
 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: Rain. Highs 53 to 60. Southeast winds 10 to 15 mph. Gusts up to 20 mph increasing to 35 mph in the afternoon.

Tonight: Cloudy. Rain in the evening, then a chance of rain showers after midnight. Lows 45 to 51. Southeast winds 10 to 15 mph. Gusts up to 35 mph in the evening.

Saturday: Mostly cloudy. A chance of rain showers in the morning, then a slight chance of rain showers in the afternoon. Warmer. Highs 58 to 67. Northwest winds up to 10 mph.

Saturday Night: Mostly cloudy in the evening then becoming partly cloudy. Lows 43 to 49. Northwest winds up to 10 mph.

Sunday: Mostly cloudy. A slight chance of rain in the morning, then a chance of rain in the afternoon. Highs 54 to 62. Light winds.

Sunday Night: Rain showers likely. Lows 44 to 50.

Monday: Mostly cloudy with a chance of rain showers. Highs 57 to 67.

Monday Night: Mostly cloudy with a slight chance of rain showers. Lows 42 to 50.

Tuesday through Wednesday: Mostly clear. Highs 65 to 75. Lows 42 to 52.

Wednesday Night: Partly cloudy. Lows 48 to 54.

Thursday: Partly cloudy with a slight chance of rain showers. Highs 61 to 71.
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.