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
Issuance Time: Oct 19 2021 at 8:47 AM PDTNext Issuance: Oct 20 2021 at 9:00 AM PDT
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.

Verification - Historical Graphical RVF
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To view other verification locations, use our Historical Graphical River Forecast Interface.
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: Mostly sunny. Highs 65 to 72. Southeast winds up to 15 mph.

Tonight: Mostly cloudy. A slight chance of rain in the evening, then rain likely after midnight. Lows 48 to 56. Southeast winds 10 to 15 mph with gusts to around 25 mph.

Wednesday: Cloudy. Rain likely in the morning, then a chance of rain in the afternoon. Highs 64 to 72. Southeast winds 10 to 15 mph with gusts to around 25 mph.

Wednesday Night: Mostly cloudy with a chance of rain. Lows 51 to 59. Southeast winds up to 10 mph.

Thursday: Mostly cloudy with a chance of rain. Highs 68 to 76. Southeast winds up to 10 mph shifting to the south around 10 mph in the afternoon.

Thursday Night: Mostly cloudy with a chance of rain. Lows 52 to 60.

Friday: Rain likely. Highs 62 to 70.

Friday Night: Mostly cloudy with a slight chance of rain showers. Cooler. Lows 46 to 54.

Saturday: Mostly cloudy. Highs 61 to 67.

Saturday Night: Mostly cloudy with a chance of rain showers. Lows 48 to 56.

Sunday: Mostly cloudy with rain showers likely. Highs 59 to 65.

Sunday Night: Mostly cloudy with rain likely. Lows 50 to 56.

Monday: Rain showers likely. Highs 57 to 63.
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.