Gauge Description:

Boating on the Tuolomne can be divided into two seasons: Spring spill season and Summer powerhouse release season. The spring, high flow season can have very high flows that are suitable for only the most-skilled paddlers. Commercial rafting trips rarely begin above 8,000 cfs. 6,000 cfs is considered an above normal flow, and 3,000-4,000 cfs is considered a very good flow. Once spills from Hetch Hetchy & Lake Eleanor cease, flows are around 1,500 cfs or less. During non spill, flows are a combination of powerhouse outflow from Holm Powerhouse on Cherry Creek, and a minimum release into the Tuolumne River from Early Intake diversion.

The flow from Holm Powerhouse takes a few hours to reach Meral's Pool.


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Tuolumne river release bulletins for 2007
Tuolumne river release Calendar for 2007


Inflows to New Don Pedro Reservoir will be mostly the flow from the river, although there are some low elevation creeks that can have a large effect during the winter.   Inflow is reported as a 24 hour average after midnight.

Gauge Information

Name Range Difficulty Updated Level
Tuolumne River Below Confluence with Cherry Creek
virtual-10553 600 - 10000 cfs IV 01h02m 187.5 cfs (too low)

gauge graph
RangeWater LevelDifficultyComment
600 -10000 cfs barely runnable-high runnable IV gauge is important or has warning

Reports give the public a chance to report on river conditions throughout the country as well as log the history of a river.