LakeLevelIs Hetch Hetchy Reservoir low right now?
Hetch Hetchy Reservoir was at 3,762.60 ft on October 10, 2026. That is 0.29 ft below the typical level for October 10, within the normal range. Over the past week the lake has been falling about 0.40 ft a day.
Hetch Hetchy Reservoir on Oct 10 in past years
20253,761.9+0.8
20243,763.9−1.3
20233,793.1−30.5
20223,761.5+1.1
20213,736.7+25.9
20203,758.8+3.8
Daily levels, last two weeks
| Date | Level (ft) | Change |
|---|---|---|
| Oct 10 | 3,762.60 | −0.27 |
| Oct 9 | 3,762.87 | −0.44 |
| Oct 8 | 3,763.31 | −0.41 |
| Oct 7 | 3,763.72 | −0.42 |
| Oct 6 | 3,764.14 | −0.41 |
| Oct 5 | 3,764.55 | −0.41 |
| Oct 4 | 3,764.96 | −0.41 |
| Oct 3 | 3,765.37 | −0.41 |
| Oct 2 | 3,765.78 | −0.42 |
| Oct 1 | 3,766.20 | −0.39 |
| Sep 30 | 3,766.59 | −0.46 |
| Sep 29 | 3,767.05 | −0.49 |
| Sep 28 | 3,767.54 | −0.45 |
| Sep 27 | 3,767.99 | −0.46 |
About Hetch Hetchy Reservoir
- 10-year range
- 3,698.6 ft (April 1, 2021) to 3,806.8 ft (June 22, 2016)
- Data
- California Data Exchange Center (DWR) — station HHY
- Datum
- ft (CDEC; typically NGVD29/NAVD88 per station)
Lakes near Hetch Hetchy Reservoir
- Lake EleanorCalifornia · 5 mi 4,648.2 ft −2.4 wkLower than usual for this time of year
- Cherry LakeCalifornia · 7 mi 4,683.3 ft +1.0 wkNormal for this time of year
- Beardsley LakeCalifornia · 24 mi 3,348.7 ft −0.8 wkLatest reading
- DONNELL LakeCalifornia · 28 mi 4,798.1 ft −14.0 wkLatest reading
- Utica ReservoirCalifornia · 36 mi 6,815.3 ft −0.2 wkNormal for this time of year
- North Fork Diversion LakeCalifornia · 36 mi 6,676.4 ft +0.0 wkNormal for this time of year
Questions
Is Hetch Hetchy Reservoir low right now?
Hetch Hetchy Reservoir was at 3,762.60 ft on October 10, 2026. That is 0.29 ft below the typical level for October 10, within the normal range. Over the past week the lake has been falling about 0.40 ft a day.
How often is the Hetch Hetchy Reservoir level updated?
The operator reports every 15 minutes to an hour. This page refreshes several times a day; the time of the latest reading is shown next to the level.
Where does this data come from?
California Data Exchange Center (DWR) (station HHY). Readings are provisional and can be revised.