SAN JOAQUIN RIVER - PATTERSON (PATC1)
Latitude: 37.49º N	Longitude: 121.08º W	Elevation: 97 Feet
Location: Stanislaus County in CA
River Group: San Joaquin

Forecast Issued:	Jan 09 2026 at 1:17 PM PST
Next Issuance:	Jan 10 2026 at 9:00 AM PST

Action/ Monitor: 48.0 Ft

Minor Flood: 54.7 Ft

Moderate Flood: 57.3 Ft

Major Flood: 58.3 Ft

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Historical Stage/Flow Data
Note: Water Year 2025 is currently showing peak daily mean values. These will be updated to instantaneous peaks in the coming months.
Water Year	Peak Discharge (cfs)	Stage (feet)	Date
Most Recent 5 Years
2025*	3,474	37.43	Mar 23, 2025
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
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
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.