Hetch Hetchy Reservoir A Hetch Hetchy water level

Name: Hetch Hetchy Reservoir A 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

Reservoir, California, United States

Directions

Latest reading

Surface elevation

3,760.72ft Down 0.43 ft over the last 24 hours

Measured Oct 18, 2026, 08:00 PM PDT (54 min ago)

Water stored: 272,000 acre‑ft

History

7 days

Surface elevation

What this means

Hetch Hetchy Reservoir A Hetch Hetchy reads 3,760.72 ft as of Oct 18, 2026, 08:00 PM PDT. There is no published reference for this reservoir yet, so we can't say whether that is high or low for the season.

It has dropped 0.43 ft over the past 24 hours. In the last month it has stayed between 3,760.72 ft and 3,761.89 ft.

The agency publishes no normal range for this gauge yet, so we show the trend only. How to read levels

On the water at Hetch Hetchy Reservoir A Hetch Hetchy

Watch the chart rather than the single number; it shows whether the shoreline is moving.

Wear a life jacket on the water. Most boating deaths involve people who were not wearing one.

Weather at the gauge

No rain in the last 3 days.

17 Sat 81° 56° – Wind 12 mph

18 Sun 77° 57° – Wind 11 mph

19 Mon 72° 50° – Wind 14 mph

20 Tue 67° 47° 0.10 in Wind 13 mph

21 Wed 52° 44° 0.46 in, 64% Wind 9 mph

22 Thu 51° 43° 0.15 in, 67% Wind 6 mph

23 Fri 64° 41° – Wind 10 mph

Forecast: Open-Meteo

Sunrise 07:12 AM Sunset 06:17 PM Daylight 11 hr, 5 min First quarter 55%

Map

Nearby gauges

Gauge	Level	Compared with normal	24 hours	Distance
Tuolumne River near Hetch HetchyRiver gauge, Tuolumne River	57.7 cfs	Normal	±0	0.9 mi
Eleanor Creek near Hetch HetchyRiver gauge, Eleanor Creek	11.3 cfs	Normal	±0	5.3 mi
Cherry Creek below Valley Dam near Hetch HetchyRiver gauge, Cherry Creek	6.9 cfs	Normal	±0	7 mi
Tuolumne R A Grand Canyon of Tuolumne above Hetch HetchyRiver gauge, Tuolumne R A Grand Canyon of Tuolumne	7.1 cfs	Low	−0.5 cfs	7 mi
Tuolumne River above Early Intake near MatherRiver gauge, Tuolumne River	50.8 cfs	Normal	±0	10 mi
Cherry Creek near Early IntakeRiver gauge, Cherry Creek	15.5 cfs	Normal	±0	10 mi
Cherry Creek below Dion R Holm Ph near MatherRiver gauge, Cherry Creek	18.5 cfs	Very low	+0.5 cfs	11 mi
Tuolumne River below Early Intake near MatherRiver gauge, Tuolumne River	50.5 cfs	Normal	±0	11 mi

Questions and answers

Is Hetch Hetchy Reservoir A Hetch Hetchy really 3,760.72 ft deep?

No. 3,760.72 ft is the height of the water surface above sea level (or the agency's vertical datum), not the depth of the water.

What is the water level of Hetch Hetchy Reservoir A Hetch Hetchy today?

On Oct 18, 2026, 08:00 PM PDT, the surface elevation was 3,760.72 ft. Down 0.43 ft over the last 24 hours.

Is Hetch Hetchy Reservoir A Hetch Hetchy rising or falling?

Down 0.43 ft over the last 24 hours.

Is the level of Hetch Hetchy Reservoir A Hetch Hetchy normal?

The agency publishes no normal range for this gauge yet, so we show the trend only.

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:11275500 (Agency page)
Coordinates: 37.94769, -119.78792 (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
Surface elevation	3,760.72 ft	2026-10-19 03:00	Provisional
Water stored	272,000 acre‑ft	2026-10-19 03:00	Provisional

Download

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How to cite

U.S. Geological Survey: Hetch Hetchy Reservoir A Hetch Hetchy (usgs:11275500). Accessed October 19, 2026 via Nivelmap, https://nivelmap.com/en/united-states/california/hetch-hetchy-reservoir-a-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