Lake levels
Mann Lake, ID
- water level
- 1790.73 ft
- Condition
- High for this time of year
- 7-day change
- +0.24 ft
- 30-day change
- +0.93 ft
- 1-year change
- +3.49 ft
Reading as of 2026-09-30 | the U.S. Bureau of Reclamation
- Since yesterday
- -0.10 ft
- 7-day change
- +0.24 ft
- 30-day change
- +0.93 ft
- 1-year change
- +3.49 ft
- Record high
- 1803.93 ft
In brief
Mann Lake stood at 1,790.73 feet on Sep 30, 2026. That is higher than 87% of September readings since 2022.
Source: U.S. Bureau of Reclamation
Lake level timeline
Records and averages
| Current level | 1790.73 ft |
|---|---|
| Record high | 1803.93 ft (2022-06-13) |
| Record low | 1787.18 ft (2023-01-30) |
| Average of all readings | 1792.11 ft |
| Data span | 4 years (1,998 readings) |
Level schematic
Trout stocking on Mann Lake
IDFG stocked Mann Lake 5 times in 2026, 19,321 fish in total. Yellow Trout and Rainbow Trout - Triploid and Channel Catfish at Catchable (12-14 inches) and Catchable (6+ inches). IDFG's published figures for 2026, the most recent season it has confirmed, record 18,321 trout actually released here across 5 visits.
| Species | Fish | When |
|---|---|---|
| Yellow Trout | 6,012 | March 2026 |
| Yellow Trout | 6,052 | April 2026 |
| Rainbow Trout - Triploid | 250 | April 2026 |
| Yellow Trout | 6,007 | May 2026 |
| Channel Catfish | 1,000 | August 2026 |
IDFG lists a week or a month rather than a date, and counts fish as an estimate. Full Idaho stocking schedule →
Frequently asked questions
Is Mann Lake full right now?
As of 2026-09-30, Mann Lake sits at 1790.73 ft, which is high for this time of year. Over the past 30 days the level has risen 0.93 ft.
What is the water level at Mann Lake today?
The most recent reading at Mann Lake is 1790.73 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 Mann Lake has ever been?
The highest level for Mann Lake in our records is 1803.93 ft on 2022-06-13. The lowest is 1787.18 ft on 2023-01-30. Our record covers about 4 years of readings.
Is Mann Lake low for this time of year?
Compared with every September in our records, the current level is higher than 87% of them, which we classify as high 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 Mann 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. Mann Lake has risen 0.93 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 Mann Lake changed over the past year?
Mann Lake is +3.49 ft compared with this date last year (1790.73 ft today). The full-history chart above covers 4 years, with a record high of 1803.93 ft and a record low of 1787.18 ft.
Download and cite
Quote this reading
Mann Lake stood at 1,790.73 feet on Sep 30, 2026. That is higher than 87% of September readings since 2022.
Download the full record
mann-lake-id-water-level-history.csv
How to cite
MyWaterLevel, “Mann Lake water level, 2022 to 2026,” data from U.S. Bureau of Reclamation, https://mywaterlevel.com/lake/id/mann-lake/, accessed Oct 13, 2026.
Source: the U.S. Bureau of Reclamation. All Idaho lake levels. Readings are provisional and may be revised. About our data and methods.