CNRFC - Hydrology - Observed River/Reservoir Conditions

SAN JOAQUIN RIVER - PATTERSON (PATC1)

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

Monitor Stage: 48.0 Feet

Flood Stage: 54.7 Feet

Danger Stage: 55.7 Feet

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

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
Upstream Photo	Gage House Photo	Downstream Photo

ESRI™ Locator Map

Official 7 Day National Weather Service Forecast (CAZ019)

Today: Mostly cloudy. Patchy fog in the morning. Areas of dense fog and locally dense early in the afternoon. A chance of rain showers late in the afternoon. Warmer. Highs 58 to 66. Southeast winds up to 15 mph. Gusts up to 30 mph in the afternoon.

Tonight: Rain showers likely and a slight chance of thunderstorms in the evening, then a chance of rain showers and a slight chance of thunderstorms after midnight. Patchy fog after midnight. Lows 42 to 47. South winds 10 to 20 mph with gusts to around 45 mph.

Sunday: Areas of fog in the morning. A chance of rain showers and a slight chance of thunderstorms in the morning, then rain showers likely and a slight chance of thunderstorms in the afternoon. Highs 49 to 57. South winds around 10 mph shifting to the west in the afternoon. Gusts up to 30 mph.

Sunday Night: Mostly cloudy in the evening then clearing. Colder. Lows 33 to 41. Northwest winds 10 to 15 mph. Gusts up to 35 mph decreasing to 20 mph after midnight.

Monday: Mostly cloudy in the morning then clearing. Highs 51 to 59. Northwest winds 10 to 15 mph with gusts to around 25 mph.

Monday Night: Clear. Lows 33 to 39.

Tuesday: Mostly sunny. Patchy frost. Highs 55 to 60.

Tuesday Night: Mostly clear. Lows 35 to 41.

Wednesday through Thursday Night: Clear. Highs 56 to 64. Lows 34 to 44.

Friday: Mostly sunny. Highs 61 to 67.

Impacts - E19 Information
58.3 Feet	Stages 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.

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