TUOLUMNE RIVER

Last Updated: April 14, 2026

Total streamflow across the Tuolumne River was last observed at 1,070 cfs, and is expected to yield approximately 2,122 acre-ft of water today; about 12% of normal. River levels are low and may signify a drought. Average streamflow for this time of year is 8,687 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 A Grand Cyn Of Tuolumne Ab Hetch Hetchy reporting a streamflow rate of 1,070 cfs. However, the streamgauge with the highest stage along the river is the Tuolumne R A Modesto Ca with a gauge stage of 37.05 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 2026-04-14
Discharge Volume 2,122 ACRE-FT
Streamflow 1,070.0 cfs
Past 24 Hours: -50.0 cfs (-4.46%)
Percent of Normal 12.32%
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 		1070 cfs 11.25 ft -4.46
Tuolumne R Nr Hetch Hetchy Ca
USGS 11276500 		227 cfs 4.28 ft 0
Tuolumne R Ab Early Intake Nr Mather Ca
USGS 11276600 		351 cfs 13.61 ft -11.59
Tuolumne R Bl Early Intake Nr Mather Ca
USGS 11276900 		921 cfs 5.56 ft -4.56
Tuolumne R Bl Lagrange Dam Nr Lagrange Ca
USGS 11289650 		229 cfs 4.62 ft -0.87
Tuolumne R A Modesto Ca
USGS 11290000 		244 cfs 37.05 ft -5.79
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.