Conconcully Reservoir water level — Washington
Conconcully Reservoir in Washington was last measured at 2,255.39 ft (datum NGVD29), as of Aug 31, 2026, 12:45 AM (UTC-07:00) (USGS Water Services). Over its recent trend window the level has been falling (−10.6 ft). This reading is provisional and subject to revision.
- % of conservation pool full
- Not reported
- Storage
- Not reported
- Recent trend
- ↓Falling
−10.6 ft over the trend window
Recent trend
Readings this station published between Jun 2, 2026 and Aug 31, 2026 — a 89-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: USGS site 12446480, retrieved Aug 31, 2026, 8:24 AM (UTC+00:00). Official page for this lake →
The dam behind Conconcully Reservoir
Conconcully Reservoir is held back by Conconully Dam (also recorded as Conconully Reservoir) , an earthfill embankment, holding the pool back by sheer mass and an impervious core rather than by the strength of concrete , standing 72 ft high and running 1,075 ft along its crest , built across SALMON CREEK in Okanogan County , near OKANOGAN . It was completed in 1911 , and is owned by BUREAU OF RECLAMATION (a federal owner) .
Its recorded primary purpose is irrigation — the pool is drawn down across the growing season to serve water rights downstream, then refilled over winter .
Its spillway is ungated: once the pool reaches the crest, water leaves on its own and the operator cannot hold it back. The spillway opening is 149 ft wide.
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.
At its normal pool the reservoir covers about 450 acres. NID records a maximum storage of 16,570 acre-ft against a normal storage of 13,000 acre-ft. Its maximum discharge capacity is 11,580 cubic feet per second.
Dam facts: National Inventory of Dams record WA00259 , filed by Bureau of Reclamation — U.S. Army Corps of Engineers, public domain. Water levels above come from USGS Water Services and are a separate source. (How this dam was matched to this gauge →)
How Conconcully 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 |
|---|---|---|---|
| Conconully Lake at Conconully | WA | 2,300.91 ft | 2 km |
| Osoyoos Lake | WA | 911.28 ft | 52 km |
| Franklin Roosevelt Lake | WA | 1,284.17 ft | 86 km |
| Lenore Lake | WA | 1,076.92 ft | 115 km |
| Soap Lake | WA | 1,068.53 ft | 128 km |
| Baker Lake | WA | 725.81 ft | 144 km |
Frequently asked questions
- What is the current water level of Conconcully Reservoir?
- As of Aug 31, 2026, 12:45 AM (UTC-07:00), the pool elevation was 2,255.39 ft (datum NGVD29), provisional and subject to revision. See the trend chart above for the recent direction.
- Is Conconcully 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 USGS site 12446480, retrieved Aug 31, 2026, 8:24 AM (UTC+00:00).
More in Washington
See every lake tracked in Washington, or read the methodology behind these figures.