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:	Apr 07 2026 at 2:16 PM PDT
Next Issuance:	Apr 08 2026 at 9:00 AM PDT

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
Water Year	Peak Discharge (cfs)	Stage (feet)	Date
Most Recent 5 Years
2025*	3,590	37.63	Mar 22, 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.