Tuolumne R A Grand Canyon of Tuolumne above Hetch Hetchy water level

Name: Tuolumne R A Grand Canyon of Tuolumne above Hetch Hetchy water level (U.S. Geological Survey)
Creator: U.S. Geological Survey
License: https://www.usgs.gov/information-policies-and-instructions/copyrights-and-credits

River gauge, Tuolumne R A Grand Canyon of Tuolumne, California, United States

Directions

Low for late October

Water level

6.63ft Steady over the last 24 hours

Measured Oct 21, 2026, 02:00 AM PDT (34 min ago)

Flow: 6.9 cfs
Water temperature: 54 °F

History

7 days

Water level

What this means

The Tuolumne R A Grand Canyon of Tuolumne above Hetch Hetchy is running below normal at 6.63 ft.

It has barely moved over the past 24 hours. Without real rain upstream, that is unlikely to change quickly. In the last month it has stayed between 6.62 ft and 6.69 ft.

Fall is often low-water season on rivers, and it usually takes a few days of steady rain to change that. The water temperature at the gauge is 54 °F.

Compared with 5 years of daily readings for this time of year. How to read levels

Floating and fishing near Tuolumne R A Grand Canyon of Tuolumne above Hetch Hetchy

Low water exposes gravel bars that make good wading access, but some boat ramps may be left high and dry.

Weather at the gauge

The forecast is not available right now.

Sunrise 07:14 AM Sunset 06:14 PM Daylight 11 hr, 1 min Waxing gibbous 76%

Map

Nearby gauges

Gauge	Level	Compared with normal	24 hours	Distance
Tuolumne River near Hetch HetchyRiver gauge, Tuolumne River	55.9 cfs	Normal	±0	8 mi
Eleanor Creek near Hetch HetchyRiver gauge, Eleanor Creek	10.6 cfs	Normal	−0.2 cfs	13 mi
Merced R A Pohono Bridge near YosemiteRiver gauge, Merced R A Pohono Bridge	0.94 ft	Below flood stage	−0.03 ft	14 mi
Merced R A Happy Isles Bridge near YosemiteRiver gauge, Merced R A Happy Isles Bridge	0.56 ft	Below flood stage	±0	14 mi
Cherry Creek below Valley Dam near Hetch HetchyRiver gauge, Cherry Creek	6.9 cfs	Normal	±0	14 mi
Tuolumne River above Early Intake near MatherRiver gauge, Tuolumne River	47.4 cfs	Normal	−2.3 cfs	16 mi
Cherry Creek near Early IntakeRiver gauge, Cherry Creek	14.8 cfs	Normal	±0	17 mi
Cherry Creek below Dion R Holm Ph near MatherRiver gauge, Cherry Creek	18.0 cfs	Very low	±0	17 mi

Questions and answers

Is gage height the same as water depth?

No. Gage height is measured from a fixed reference point chosen by the agency, so a reading of 10 ft does not mean the river is 10 ft deep.

What is the water level of Tuolumne R A Grand Canyon of Tuolumne above Hetch Hetchy today?

On Oct 21, 2026, 02:00 AM PDT, the water level was 6.63 ft. Steady over the last 24 hours.

Is Tuolumne R A Grand Canyon of Tuolumne above Hetch Hetchy rising or falling?

Steady over the last 24 hours.

Is the level of Tuolumne R A Grand Canyon of Tuolumne above Hetch Hetchy normal?

Low for late October. Compared with 5 years of daily readings for this time of year.

How often is this data updated?

The U.S. Geological Survey publishes a new reading every 15 minutes. This page refreshes within minutes of each update.

Where does this data come from?

The values come directly from the U.S. Geological Survey, the official operator of this gauge, and are in the public domain. We do not estimate or model live values.

For specialists

Station codes, datum, parameters, data quality and downloads

Operator: U.S. Geological Survey
Station code: usgs:11274790 (Agency page)
Coordinates: 37.91658, -119.65986 (WGS84)
Vertical datum: NAVD88
Update interval: every 15 minutes
Licence: Public domain. Data: U.S. Geological Survey (USGS), provisional data subject to revision

Published series

Parameter	Last value	Time (UTC)	Quality
Water level	6.63 ft	2026-10-21 09:00	Provisional
Flow	6.9 cfs	2026-10-21 09:00	Provisional
Water temperature	54 °F	2026-10-21 09:00	Provisional

Download

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How to cite

U.S. Geological Survey: Tuolumne R A Grand Canyon of Tuolumne above Hetch Hetchy (usgs:11274790). Accessed October 21, 2026 via Nivelmap, https://nivelmap.com/en/united-states/california/tuolumne-r-a-grand-canyon-of-tuolumne-above-hetch-hetchy

How we check values

Each reading is stored as published. We hold back values that jump faster than physically plausible and show the measurement time with every value.

Readings are provisional, can be delayed or wrong and are not a flood warning. Read the disclaimer