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Wyoming · US Bureau of Reclamation (Keyhole Dam)

Keyhole Reservoir water level

Today's reading against full pool and Keyhole Reservoir's own seasonal history.

Searched “Keyhole lake level” or “lake level for Keyhole Reservoir”? Same lake, same reading — you're in the right place. The current reading is right here too, whether you typed “current Keyhole Reservoir water level” or “current water level at Keyhole Reservoir”.

FULL POOL 4080 4085 4090 4095 4100
Elevation, feet (USBR project datum)

as of September 24, 2026

4084.00 ft USBR project datum

level 15.3 ft below full pool — on the low side for late September

Reading comes straight from U.S. Army Corps of Engineers Access to Water data (USACE lake gauge) and updates live when you load this page.

Is Keyhole Reservoir full?

Not quite — 15.3 ft below full pool as of September 24, 2026

How full is Keyhole Reservoir? Not as a percentage: no storage figure comes through with this gauge reading, and a share of capacity worked out from the elevation alone would be a guess — how much water a reservoir holds at a given level is a curve only the operator's own capacity table knows. Feet from full pool is what the operator publishes, and it is the figure above.

Keyhole Reservoir through the year

The band is the lake's own normal: where the level has run on each calendar day, 1990–2026. The summer drawdown — and how this year sits in it — shows up without reading a single number.

full pool 4080 4090 4100 JFMAMJJASOND
Median and normal range by day of year, 1990–2026 · elevation, feet (USBR project datum)

This year vs the years that matter

This year's trace against last year and the driest and wettest years on record — the drought-context question every lake regular asks.

full pool 4060 4070 4080 4090 4100 JFMAMJJASOND
  • 2026 (this year)
  • 2025 (last year)
  • 2015 (wettest on record)
  • 1992 (driest on record)

Full pool, datum, and the gauge

"Full pool" here means the conservation pool — the level the lake is designed to hold for water supply and recreation, not the flood-control space above it. The full explainer covers flood pool and dead pool too.

Full pool 4099.30 ft USBR project datum · per US Bureau of Reclamation (Keyhole Dam) full-pool reference
Conservation capacity 188,669 acre-feet · per US Bureau of Reclamation (Keyhole Dam) capacity reference
Gauge USACE lake gauge · U.S. Army Corps of Engineers Access to Water data
Datum USBR project datum — 4099.3 = top of active conservation (also spillway crest); confirmed identically by USBR project page and USACE CDA levels.
Last verified August 15, 2026

LakeDates reports lake level, not ramp status. Whether a given ramp or marina is usable at this level varies ramp by ramp — call the marina before you tow.

Quick answers

What is the lake level for Keyhole Reservoir today?

Keyhole Reservoir is at 4084.00 ft (USBR project datum) as of September 24, 2026 — 15.3 ft below full pool — on the low side for late September.

Is Keyhole Reservoir full?

Not quite — at 4084.00 ft on September 24, 2026, Keyhole Reservoir is 15.3 ft below its full pool of 4099.30 ft (USBR project datum).

How full is Keyhole Reservoir?

Not as a percentage: no storage figure comes through with this gauge reading, and a share of capacity worked out from the elevation alone would be a guess — how much water a reservoir holds at a given level is a curve only the operator's own capacity table knows. Feet from full pool is what the operator publishes, and it is the figure above.

What is full pool for Keyhole Reservoir?

Full pool (the conservation pool) for Keyhole Reservoir is 4099.30 ft USBR project datum, per US Bureau of Reclamation (Keyhole Dam) full-pool reference. Levels above it use flood storage; levels below it are drawdown.