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 CaliforniaBulletin Group: San JoaquinRiver Group: San Joaquin
Issuance Time: Mar 04 2024 at 2:00 PM PSTNext Issuance: Mar 05 2024 at 9:00 AM PST
Monitor Stage: 48.0 FeetFlood Stage: 54.7 FeetDanger Stage: 55.7 Feet

Please Note: Each individual timeseries plotted on the graphical river forecast can be toggled on and off by clicking the legend entry above. If the "Observed (Raw Data)" contains bad data and is toggled off, the plot will scale to the remaining timeseries.
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
2022
1,190
33.41
Dec 31, 2021
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
 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
Impacts - E19 Information
58.3 FeetStages above 58.3 feet result in flooding outside the levee. Top of levee.
Official 7 Day National Weather Service Forecast   (CAZ019)
Tonight: Mostly cloudy. Lows 40 to 46. Light winds becoming southeast up to 10 mph after midnight.

Tuesday: Partly cloudy in the morning then becoming mostly cloudy. Highs 56 to 65. Southeast winds up to 10 mph.

Tuesday Night: Mostly cloudy. A slight chance of rain showers after midnight. Lows 42 to 48. South winds around 10 mph shifting to the east up to 10 mph after midnight.

Wednesday: Mostly cloudy with a slight chance of rain showers. Highs 57 to 66. East winds up to 10 mph.

Wednesday Night: Partly cloudy. Lows 41 to 47. Northwest winds up to 10 mph.

Thursday: Mostly cloudy. Highs 56 to 64.

Thursday Night: Clear. Lows 38 to 44.

Friday and Friday Night: Clear. Highs 59 to 67. Lows 38 to 45.

Saturday through Sunday: Partly cloudy. Highs 58 to 66. Lows 39 to 46.

Sunday Night and Monday: Mostly cloudy with a slight chance of rain showers. Lows 42 to 48. Highs 58 to 66.
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.