TUOLUMNE RIVER

Last Updated: May 10, 2026

Total streamflow across the Tuolumne River was last observed at 14,400 cfs, and is expected to yield approximately 28,562 acre-ft of water today; about 100% of normal. Average streamflow for this time of year is 14,343 cfs, with recent peaks last observed on 2023-05-26 when daily discharge volume was observed at 51,230 cfs.

Maximum discharge along the river is currently at the Tuolumne R Bl Early Intake Nr Mather Ca reporting a streamflow rate of 4,890 cfs. However, the streamgauge with the highest stage along the river is the Tuolumne R A Modesto Ca with a gauge stage of 36.96 ft. This river is monitored from 6 different streamgauging stations along the Tuolumne River, the highest being situated at an altitude of 3,831 ft, the Tuolumne R A Grand Cyn Of Tuolumne Ab Hetch Hetchy.

Get the latest River Levels, Streamflow, and Hydrology for in River flows across 6 streamgages of the Tuolumne River


15-Day Long Term Forecast


River Details

Last Updated 2026-05-09
Discharge Volume 28,562 ACRE-FT
Streamflow 14,400.0 cfs
Past 24 Hours: +5170.0 cfs (+56.01%)
Percent of Normal 100.4%
Maximum 51,230.0 cfs
2023-05-26
Seasonal Avg cfs
       
River Streamflow Levels
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Streamgauge Streamflow Gauge Stage 24hr Change (%) % Normal Minimum (cfs) Maximum (cfs) Air Temp Elevation
Tuolumne R A Grand Cyn Of Tuolumne Ab Hetch Hetchy
USGS 11274790 		1990 cfs 12.87 ft 6.99
Tuolumne R Nr Hetch Hetchy Ca
USGS 11276500 		3570 cfs 9.82 ft 63.01
Tuolumne R Ab Early Intake Nr Mather Ca
USGS 11276600 		3950 cfs 18.31 ft 73.25
Tuolumne R Bl Early Intake Nr Mather Ca
USGS 11276900 		4890 cfs 8.45 ft 68.62
Tuolumne R Bl Lagrange Dam Nr Lagrange Ca
USGS 11289650 		186 cfs 4.43 ft -6.53
Tuolumne R A Modesto Ca
USGS 11290000 		221 cfs 36.96 ft -7.53
Seasonal Discharge Comparison
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Maximum Streamflow Discharge
Streamflow Elevation Profile

The river has a rich history, having been home to indigenous communities for thousands of years and later serving as a vital transportation route during the California Gold Rush. Today, the river is used for agricultural irrigation and hydropower generation. It is also home to several reservoirs and dams, including the Don Pedro Dam, the New Don Pedro Reservoir, and the Hetch Hetchy Reservoir. These provide drinking water to the San Francisco Bay Area and irrigation water to the Central Valley. The Tuolumne River is also popular for recreational activities such as fishing, camping, hiking, and whitewater rafting.

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