Del Valle Dam & Reservoir water level — California
Del Valle Dam & Reservoir in California was last measured at 695.18 ft (datum NGVD29), as of Aug 31, 2026, 7:00 AM (UTC+00:00) (USACE CWMS Data). Over its recent trend window the level has been falling (−5.1 ft).
- % of conservation pool full
- Not reported
- Storage
- 34,618 acre-ft
- Recent trend
- ↓Falling
−5.1 ft over the trend window
Recent trend
Readings this station published between Jun 23, 2026 and Jul 13, 2026 — a 20-day window — downsampled for display.
Data: USGS Water Services (waterservices.usgs.gov) and USACE CWMS Data (cwms-data.usace.army.mil), retrieved 2026-08-31. Both public domain (a work of the U.S. Government, 17 U.S.C. §105).
Source: USACE SPK/Del Valle, retrieved Aug 31, 2026, 8:24 AM (UTC+00:00). Official page for this lake →
The dam behind Del Valle Dam & Reservoir
Del Valle Dam & Reservoir is held back by Del Valle , an earthfill embankment, holding the pool back by sheer mass and an impervious core rather than by the strength of concrete , standing 222 ft high and running 880 ft along its crest , built across Arroyo Valle in Alameda County , near Livermore . It was completed in 1968 , and is owned by California Department of Water Resources (a state owner) .
Its recorded primary purpose is flood risk reduction — the pool is drawn down between storms so there is empty space waiting for the next flood, which is why this level can fall in dry weather and climb sharply after rain . It also serves flood risk reduction;irrigation;recreation;water supply.
NID classes it high hazard potential. That describes what a failure would cost downstream — loss of life would be expected — and says nothing about how likely a failure is, or what condition the dam is in. Its most recent condition assessment was fair: sound under normal loading, though a rare or extreme event could expose a deficiency. That assessment is dated 10/09/2025.
At its normal pool the reservoir covers about 710 acres. NID records a maximum storage of 77,100 acre-ft. Its maximum discharge capacity is 47,000 cubic feet per second. It is regulated by DWR, Division of Safety of Dams.
Dam facts: National Inventory of Dams record CA00043 , filed by California — U.S. Army Corps of Engineers, public domain. Water levels above come from USACE CWMS Data and are a separate source. (How this dam was matched to this gauge →)
How Del Valle Dam & Reservoir compares nearby
5 of 6 nearby lakes with a current trend are also falling right now.
Nearby lakes
The six nearest published lakes by centroid distance (great-circle) — cross-state neighbors included.
| Lake | State | Level | Distance |
|---|---|---|---|
| San Antonio Reservoir | CA | 455.56 ft | 10 km |
| Calaveras Reservoir | CA | 725.83 ft | 16 km |
| Lower Crystal Springs Reservoir | CA | 272.37 ft | 55 km |
| Pilarcitos Lake | CA | 679.13 ft | 60 km |
| San Andreas Lake a Dam | CA | 443.80 ft | 60 km |
| Farmington Lake-Pool | CA | 124.47 ft | 79 km |
Frequently asked questions
- What is the current water level of Del Valle Dam & Reservoir?
- As of Aug 31, 2026, 7:00 AM (UTC+00:00), the pool elevation was 695.18 ft (datum NGVD29). See the trend chart above for the recent direction.
- Is Del Valle Dam & Reservoir full right now?
- Its managing agency does not publish a %-of-conservation-pool-full figure for this lake, so we show the bare level rather than estimate one.
- Where does this data come from?
- From USACE SPK/Del Valle, retrieved Aug 31, 2026, 8:24 AM (UTC+00:00).
More in California
See every lake tracked in California, or read the methodology behind these figures.