Old browser warning

Site look funky?  Your browser is either Internet Explorer (hit refresh (F5) several times due to a bug in Microsoft's code that we can't work around) or is 10 years old and standards-based layouts and styling confuse it.   Consider updating.  One excellent option is Mozilla Firefox, versions of which are available for Linux, Mac and Windows. Safari 1.0+ and IE 6.0+ are also supported.

Gauge Information

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.


Daily Flows Realtime Flows Dreamflows Home
Show 30 Days
Show 3 Years

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 00h47m 261.9 cfs (too low)

RangeWater LevelDifficultyComment
600 -10000 cfs barely runnable-high runnable IV

Report - Reports of Tuolumne 4) Lumsden Campground (Merals Pool) to Wards Ferry Bridge and related gauges

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


When River/Gauge Subject Level Reporter
Tuolumne4) Lumsden Campground (Merals Pool) to Wards Ferry Bridge Tuolumne, 1300 cfs 1300 cfs Paul Martzen
Tuolumne4) Lumsden Campground (Merals Pool) to Wards Ferry Bridge [CA] clavey run out n/a steven vaniman
Tuolumne [CA] Rafting Gray's Grindstone on the Tuolumne n/a Zachary Collier
Tuolumne [CA] LOOP ON THE T!!- CODY low Cody Howard
4y226d07h35m /Tuolumne-Lumsden Campground (Merals Pool) to Wards Ferry Bridge [CA] Meral's Pool n/a Matthew Henry
5y128d05h28m /Tuolumne-Lumsden Campground (Merals Pool) to Wards Ferry Bridge [CA] Steep take out trail 0 cfs Paul Martzen
5y128d10h28m @Tuolumne 4) Lumsden Campground (Merals Pool) to Wards Ferry Bridge [CA] Raft in center route at Stern's 1200 cfs Paul Martzen
> 10 years @Tuolumne 4) Lumsden Campground (Merals Pool) to Wards Ferry Bridge [CA] Brent Davis Photos of Tuolumne n/a Paul Martzen
> 10 years Tuolumne [CA] Step 4 900 cfs 5968
> 10 years Tuolumne [CA] Boat-Crunching Clavey Hole 1250 cfs Matthew Urdan
> 10 years Tuolumne [CA] Horizon Line......indeed! 900 cfs 5968