Tiber Reservoir (Lake Elwell) Water Level
Montana · Marias River
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Water level history
About Tiber Reservoir (Lake Elwell)
Tiber Reservoir (Lake Elwell) is a reservoir on the Marias River in Montana, operated by U.S. Bureau of Reclamation. Its full summer pool sits at 2993 ft above sea level. Live water levels come from the U.S. Army Corps of Engineers (CWMS) and update hourly.
Understanding Tiber Reservoir (Lake Elwell)'s water level
"Full pool" is the elevation U.S. Bureau of Reclamation targets when Tiber Reservoir (Lake Elwell) is completely filled — 2993 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 2993 ft for long. A reading a few feet under full is usually just the normal operating band rather than a sign of drought.
In a typical year the Corps keeps Tiber Reservoir (Lake Elwell) lower over winter for flood storage and lets it fill for the summer recreation season. Levels can jump several feet after a single big storm and are drawn down again once the high water passes.
The recent high and low above are drawn from the published history available for Tiber Reservoir (Lake Elwell), 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.
Tiber Reservoir (Lake Elwell) — frequently asked
What is the current water level of Tiber Reservoir (Lake Elwell)?
The gauge at the top of this page shows Tiber Reservoir (Lake Elwell)'s current elevation in feet above sea level, updated from the U.S. Army Corps of Engineers (CWMS).
What is full pool for Tiber Reservoir (Lake Elwell)?
Tiber Reservoir (Lake Elwell)'s full summer pool is 2993 feet above sea level. Levels are typically drawn down below that in winter for flood storage.
Who manages Tiber Reservoir (Lake Elwell)?
Tiber Reservoir (Lake Elwell) is operated by U.S. Bureau of Reclamation on the Marias River.
Where is Tiber Reservoir (Lake Elwell) located?
Tiber Reservoir (Lake Elwell) is in Montana, on the Marias River.
Why is Tiber Reservoir (Lake Elwell) 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 Tiber Reservoir (Lake Elwell)?
The recent record high and low elevations are shown in the stats on this page, computed from the available published history for Tiber Reservoir (Lake Elwell).
Other lakes near Tiber Reservoir (Lake Elwell)
- Bighorn LakeMT/WY
- Fort Peck LakeMT
- Canyon Ferry LakeMT
- Lake AshtabulaND
- Boysen ReservoirWY
- Flaming Gorge ReservoirUT/WY
See current levels for all 4 Montana lakes and reservoirs →
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