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)
Tonight: Clear. Lows 26 to 36. Northwest winds 10 to 15 mph in the evening becoming light.

Saturday: Areas of frost in the morning. Mostly sunny. Highs 53 to 60. Southeast winds up to 10 mph shifting to the southwest in the afternoon.

Saturday Night: Partly cloudy in the evening then clearing. Lows 29 to 39. Northwest winds around 10 mph.

Sunday: Patchy frost in the morning. Sunny. Highs 55 to 62. Northwest winds up to 10 mph.

Sunday Night: Mostly clear in the evening, then mostly cloudy with a slight chance of rain showers after midnight. Lows 35 to 43. Northwest winds around 10 mph shifting to the southwest up to 10 mph after midnight. Gusts up to 20 mph.

Monday: Rain showers likely. Highs 48 to 56.

Monday Night: Partly cloudy with a slight chance of rain showers. Colder. Lows 29 to 39.

Tuesday and Tuesday Night: Mostly clear. Highs 52 to 60. Lows 30 to 40.

Wednesday: Partly cloudy. Highs 54 to 61.

Wednesday Night: Mostly cloudy with a slight chance of rain showers. Lows 35 to 43.

Thursday through Friday: Mostly cloudy with a chance of rain showers. Highs 52 to 61. Lows 35 to 45.
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.