Lake levels
Billy Clapp Lake, WA
- water level
- 1333.78 ft
- Condition
- Low for this time of year
- 7-day change
- +0.12 ft
- 30-day change
- -0.77 ft
- 1-year change
- +1.31 ft
Reading as of 2026-09-30 | the U.S. Bureau of Reclamation
- Since yesterday
- +0.00 ft
- 7-day change
- +0.12 ft
- 30-day change
- -0.77 ft
- 1-year change
- +1.31 ft
- Record high
- 1335.98 ft
In brief
Billy Clapp Lake stood at 1,333.78 feet on Sep 30, 2026. That is lower than 84% of September readings since 2022.
Source: U.S. Bureau of Reclamation
Lake level timeline
Records and averages
| Current level | 1333.78 ft |
|---|---|
| Record high | 1335.98 ft (2026-07-19) |
| Record low | 1315.02 ft (2025-12-10) |
| Average of all readings | 1328.08 ft |
| Data span | 4 years (2,000 readings) |
Level schematic
Trout stocking on Billy Clapp Lake
WDFW stocked Billy Clapp Lake 3 times in 2026, 180,072 fish in total. Rainbow and Kokanee at Fry.
| Species | Fish | When |
|---|---|---|
| Rainbow | 74,362 | April 2026 |
| Kokanee | 51,000 | May 2026 |
| Kokanee | 54,710 | June 2026 |
WDFW lists a week or a month rather than a date, and counts fish as an estimate. Full Washington stocking schedule →
Frequently asked questions
Is Billy Clapp Lake full right now?
As of 2026-09-30, Billy Clapp Lake sits at 1333.78 ft, which is low for this time of year. Over the past 30 days the level has fallen 0.77 ft.
What is the water level at Billy Clapp Lake today?
The most recent reading at Billy Clapp Lake is 1333.78 ft (2026-09-30), sourced from the U.S. Bureau of Reclamation. Readings on this page refresh automatically as the agency publishes new data.
What is the highest Billy Clapp Lake has ever been?
The highest level for Billy Clapp Lake in our records is 1335.98 ft on 2026-07-19. The lowest is 1315.02 ft on 2025-12-10. Our record covers about 4 years of readings.
Is Billy Clapp Lake low for this time of year?
Compared with every September in our records, the current level is higher than 16% of them, which we classify as low for this time of year. Seasonal comparison matters more than the raw number, because most reservoirs draw down predictably through late summer and refill over winter and spring.
Why is Billy Clapp Lake changing right now?
Reservoir levels move for four main reasons: rainfall and runoff into the basin, releases through the dam for downstream water supply, power generation or flood control, evaporation during hot months, and seasonal drawdown schedules set by the operating agency. Billy Clapp Lake has fallen 0.77 ft over the past 30 days. For the operational reason on any given week, check the U.S. Bureau of Reclamation directly.
How much has Billy Clapp Lake changed over the past year?
Billy Clapp Lake is +1.31 ft compared with this date last year (1333.78 ft today). The full-history chart above covers 4 years, with a record high of 1335.98 ft and a record low of 1315.02 ft.
Download and cite
Quote this reading
Billy Clapp Lake stood at 1,333.78 feet on Sep 30, 2026. That is lower than 84% of September readings since 2022.
Download the full record
billy-clapp-lake-wa-water-level-history.csv
How to cite
MyWaterLevel, “Billy Clapp Lake water level, 2022 to 2026,” data from U.S. Bureau of Reclamation, https://mywaterlevel.com/lake/wa/billy-clapp-lake/, accessed Oct 13, 2026.
Source: the U.S. Bureau of Reclamation. All Washington lake levels. Readings are provisional and may be revised. About our data and methods.