CNRFC - Hydrology - River Guidance - Graphical RVF

Location:

SAN JOAQUIN RIVER - PATTERSON (PATC1)

Latitude: 37.49º N	Longitude: 121.08º W	Elevation: 97 Feet
Location: Stanislaus County in California		Bulletin Group: San Joaquin		River Group: San Joaquin

Issuance Time:

Apr 29 2025 at 8:37 AM PDT

Next Issuance:

Apr 30 2025 at 9:00 AM PDT

Action/Monitor: 48.0 Feet

Minor Flood: 54.7 Feet

Moderate Flood: 57.3 Feet

Major Flood: 58.3 Feet

Plot Type:

Please Note:
1) 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.

2) At extremely low river flows, the "Observed (Raw Data)" may show readings below the lower end of the available rating table, while the "Observed (Simulated)" will only show values at the bottom of the rating table, creating a potential discrepancy between the two readings.

Observed Data Credit
	Raw streamflow data is provided by the California Department of Water Resources. View California Department of Water Resources Data for this station location.

Historical Stage/Flow Data
Water Year	Peak Discharge (cfs)	Stage (feet)	Date
Most Recent 5 Years
2024	5,740	41.64	Mar 7, 2024
2023	24,500	52.24	Mar 27, 2023
2022	1,190	33.41	Dec 31, 2021
2021	1,770	34.50	Feb 1, 2021
2020	3,120	37.40	Oct 2, 2019
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
2023	24,500	52.24	Mar 27, 2023
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
Upstream Photo	Gage House Photo	Downstream Photo

ESRI™ Locator Map

Flood Impacts
58.3 Feet	Stages above 58.3 feet result in flooding outside the levee. Top of levee.

Official 7 Day National Weather Service Forecast (CAZ019)

Tonight: Mostly clear in the evening then becoming mostly cloudy. Lows 51 to 59. Northwest winds up to 10 mph.

Wednesday: Mostly cloudy in the morning then clearing. Highs 77 to 85. Northwest winds up to 10 mph.

Wednesday Night: Clear. Lows 52 to 58. Northwest winds up to 10 mph.

Thursday: Sunny. Highs 77 to 85. Northwest winds up to 10 mph.

Thursday Night: Clear. Lows 50 to 56. Northwest winds up to 10 mph.

Friday: Sunny. Highs 74 to 83.

Friday Night: Mostly cloudy. Lows 49 to 56.

Saturday: Mostly cloudy with a slight chance of rain showers. Highs 59 to 69.

Saturday Night and Sunday: Partly cloudy with a slight chance of rain showers. Lows 44 to 52. Highs 60 to 70.

Sunday Night through Monday Night: Mostly clear. Lows 46 to 55. Highs 63 to 73.

Tuesday: Sunny, warmer. Highs 71 to 81.

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.

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