4709.99 ft USBR project datum
level 15.0 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 Boysen Reservoir full?
Not quite — 15.0 ft below full pool as of September 24, 2026
How full is Boysen 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.
Boysen 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.
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.
- 2026 (this year)
- 2025 (last year)
- 2015 (wettest on record)
- 2002 (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 | 4725.00 ft USBR project datum · per US Bureau of Reclamation (Boysen Dam) full-pool reference |
|---|---|
| Conservation capacity | 741,594 acre-feet · per US Bureau of Reclamation (Boysen Dam) capacity reference |
| Gauge | USACE lake gauge · U.S. Army Corps of Engineers Access to Water data |
| Datum | USBR project datum — Full pool here is the 4,725.0 ft top of the joint-use pool; Reclamation lists 4,717.0 ft as the top of active conservation below it. |
| 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 Boysen Reservoir today?
Boysen Reservoir is at 4709.99 ft (USBR project datum) as of September 24, 2026 — 15.0 ft below full pool — on the low side for late September.
Is Boysen Reservoir full?
Not quite — at 4709.99 ft on September 24, 2026, Boysen Reservoir is 15.0 ft below its full pool of 4725.00 ft (USBR project datum).
How full is Boysen 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 Boysen Reservoir?
Full pool (the conservation pool) for Boysen Reservoir is 4725.00 ft USBR project datum, per US Bureau of Reclamation (Boysen Dam) full-pool reference. Levels above it use flood storage; levels below it are drawdown.