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: Sep 17 2021 at 7:52 AM PDTNext Issuance: Sep 18 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: Sunny. Highs 83 to 91. Northwest winds up to 10 mph shifting to the west around 10 mph in the afternoon.

Tonight: Clear. Lows 50 to 58. Northwest winds around 10 mph.

Saturday: Sunny. Highs 76 to 82. Northwest winds around 10 mph.

Saturday Night: Mostly clear. A slight chance of rain showers after midnight. Lows 55 to 61. Northwest winds 10 to 15 mph.

Sunday: Mostly cloudy with a slight chance of rain showers in the morning, then mostly sunny in the afternoon. Highs 74 to 80. Northwest winds up to 15 mph.

Sunday Night: Mostly clear. Lows 51 to 61.

Monday: Sunny, warmer. Highs 81 to 89.

Monday Night and Tuesday: Clear. Lows 54 to 64. Highs 83 to 93.

Tuesday Night through Wednesday Night: Mostly clear. Lows 56 to 66. Highs 87 to 95.

Thursday: Sunny. Highs 84 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.