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
2020
3,120
37.40
Oct 2, 2019
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
 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
Official 7 Day National Weather Service Forecast   (CAZ019)
Today: Partly cloudy in the morning then clearing. Breezy. Highs 70 to 80. Northwest winds 10 to 25 mph.

Tonight: Mostly clear. Lows 45 to 55. Northwest winds 10 to 15 mph with gusts to around 25 mph.

Wednesday: Mostly sunny. Highs 76 to 84. Northwest winds 10 to 15 mph with gusts to around 25 mph.

Wednesday Night: Mostly clear. Lows 48 to 58. Northwest winds up to 15 mph.

Thursday: Sunny. Highs 82 to 88. Light winds becoming northwest around 10 mph in the afternoon.

Thursday Night: Mostly clear. Lows 52 to 62.

Friday: Sunny. Highs 86 to 92.

Friday Night: Mostly clear. Lows 54 to 64.

Saturday: Sunny. Highs 85 to 90.

Saturday Night: Mostly clear. Lows 54 to 64.

Sunday: Sunny. Highs 84 to 90.

Sunday Night and Monday: Mostly clear. Lows 53 to 63. Highs 82 to 90.
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.