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: Jan 27 2022 at 1:30 PM PSTNext Issuance: Jan 28 2022 at 9:00 AM PST
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)
Tonight: Clear. Lows 33 to 42. North winds up to 10 mph shifting to the east after midnight.

Friday: Patchy frost in the morning. Partly cloudy. Highs 57 to 63. Northeast winds up to 10 mph.

Friday Night: Partly cloudy in the evening then becoming mostly cloudy. Patchy fog after midnight. Lows 36 to 44. North winds up to 10 mph.

Saturday: Mostly cloudy. Highs around 59. Northwest winds up to 10 mph.

Saturday Night: Mostly clear. Patchy fog after midnight. Lows 33 to 41. Northwest winds up to 10 mph.

Sunday: Mostly sunny. Patchy fog. Highs 57 to 63.

Sunday Night: Partly cloudy. Lows 37 to 43.

Monday: Mostly cloudy. Highs 56 to 61.

Monday Night: Mostly clear. Lows 36 to 42.

Tuesday through Wednesday: Clear. Highs 53 to 59. Lows 33 to 42.

Wednesday Night: Mostly clear. Lows 32 to 38.

Thursday: Mostly sunny. Areas of frost. Highs 55 to 60.
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.