Keyhole Reservoir Water Level
Wyoming · Belle Fourche River
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Water level history
About Keyhole Reservoir
Keyhole Reservoir is a reservoir on the Belle Fourche River in Wyoming, operated by U.S. Bureau of Reclamation. Its full summer pool sits at 4099.3 ft above sea level. Live water levels come from the U.S. Army Corps of Engineers (CWMS) and update hourly.
Understanding Keyhole Reservoir's water level
"Full pool" is the elevation U.S. Bureau of Reclamation targets when Keyhole Reservoir is completely filled — 4099.3 feet above sea level. Above that line the Corps deliberately keeps empty "flood storage" to absorb heavy rain, so the lake rarely sits far above 4099.3 ft for long. A reading a few feet under full is usually just the normal operating band rather than a sign of drought.
Keyhole Reservoir fills on spring runoff from mountain snowpack, peaks in early summer, and then falls through the rest of the year as water is released for irrigation and downstream demand. A low reading in late summer is the normal end of that cycle; a low reading in June usually means a thin snow year.
The recent high and low above are drawn from the published history available for Keyhole Reservoir, so they show how today compares over that record rather than an all-time extreme. The 12-month and 5-year chart views make the trend and the lake's usual seasonal shape easy to see.
Keyhole Reservoir — frequently asked
What is the current water level of Keyhole Reservoir?
The gauge at the top of this page shows Keyhole Reservoir's current elevation in feet above sea level, updated from the U.S. Army Corps of Engineers (CWMS).
What is full pool for Keyhole Reservoir?
Keyhole Reservoir's full summer pool is 4099.3 feet above sea level. Levels are typically drawn down below that in winter for flood storage.
Who manages Keyhole Reservoir?
Keyhole Reservoir is operated by U.S. Bureau of Reclamation on the Belle Fourche River.
Where is Keyhole Reservoir located?
Keyhole Reservoir is in Wyoming, on the Belle Fourche River.
Why is Keyhole Reservoir low right now?
Reservoir levels fall during dry spells and seasonal drawdown — when U.S. Bureau of Reclamation lowers the pool for flood storage, power, or water supply — and recover after rain and snowmelt. The history chart above shows the recent trend.
What are the record high and low levels for Keyhole Reservoir?
The recent record high and low elevations are shown in the stats on this page, computed from the available published history for Keyhole Reservoir.
Other lakes near Keyhole Reservoir
See current levels for all 5 Wyoming lakes and reservoirs →
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