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: Feb 06 2023 at 3:02 PM PSTNext Issuance: Feb 07 2023 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
2021
1,770
34.50
Feb 1, 2021
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
 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 in the morning then becoming partly cloudy. Patchy fog and frost in the morning. Highs around 57. Southeast winds up to 10 mph.

Tonight: Mostly clear. Patchy fog after midnight. Lows 34 to 42. Northwest winds up to 10 mph.

Wednesday: Mostly cloudy in the morning then clearing. Areas of fog and patchy frost in the morning. Highs 58 to 64. Northwest winds up to 10 mph.

Wednesday Night: Clear. Lows 36 to 43. North winds up to 10 mph.

Thursday: Mostly sunny. Highs around 64. Southeast winds up to 10 mph.

Thursday Night: Mostly clear. Lows 38 to 44.

Friday: Partly cloudy. Highs 59 to 65.

Friday Night: Mostly cloudy. Lows around 41.

Saturday: Partly cloudy. Highs 53 to 60.

Saturday Night and Sunday: Mostly clear. Lows 36 to 42. Highs 57 to 65.

Sunday Night: Clear. Lows 35 to 41.

Monday: Mostly sunny. Highs around 61.
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.