Lake levels
Bighorn Lake Yellowtail, MT
- water level
- 3625.19 ft
- Condition
- Low for this time of year
- 7-day change
- +0.58 ft
- 30-day change
- +2.09 ft
- 1-year change
- -6.00 ft
Reading as of 2026-10-12 | the U.S. Bureau of Reclamation
- Since yesterday
- +0.25 ft
- 7-day change
- +0.58 ft
- 30-day change
- +2.09 ft
- 1-year change
- -6.00 ft
- Record high
- 3647.72 ft
In brief
Bighorn Lake Yellowtail stood at 3,625.19 feet on Oct 12, 2026. That is lower than 94% of October readings since 2021.
Source: U.S. Bureau of Reclamation
Lake level timeline
Records and averages
| Current level | 3625.19 ft |
|---|---|
| Record high | 3647.72 ft (2023-06-30) |
| Record low | 3613.11 ft (2024-05-08) |
| Average of all readings | 3627.44 ft |
| Data span | 4 years (2,000 readings) |
Level schematic
Frequently asked questions
Is Bighorn Lake Yellowtail full right now?
As of 2026-10-12, Bighorn Lake Yellowtail sits at 3625.19 ft, which is low for this time of year. Over the past 30 days the level has risen 2.09 ft.
What is the water level at Bighorn Lake Yellowtail today?
The most recent reading at Bighorn Lake Yellowtail is 3625.19 ft (2026-10-12), sourced from the U.S. Bureau of Reclamation. Readings on this page refresh automatically as the agency publishes new data.
What is the highest Bighorn Lake Yellowtail has ever been?
The highest level for Bighorn Lake Yellowtail in our records is 3647.72 ft on 2023-06-30. The lowest is 3613.11 ft on 2024-05-08. Our record covers about 4 years of readings.
Is Bighorn Lake Yellowtail low for this time of year?
Compared with every October in our records, the current level is higher than 6% of them, which we classify as low 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 Bighorn Lake Yellowtail 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. Bighorn Lake Yellowtail has risen 2.09 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 Bighorn Lake Yellowtail changed over the past year?
Bighorn Lake Yellowtail is -6.00 ft compared with this date last year (3625.19 ft today). The full-history chart above covers 4 years, with a record high of 3647.72 ft and a record low of 3613.11 ft.
Download and cite
Quote this reading
Bighorn Lake Yellowtail stood at 3,625.19 feet on Oct 12, 2026. That is lower than 94% of October readings since 2021.
Download the full record
bighorn-lake-yellowtail-mt-water-level-history.csv
How to cite
MyWaterLevel, “Bighorn Lake Yellowtail water level, 2021 to 2026,” data from U.S. Bureau of Reclamation, https://mywaterlevel.com/lake/mt/bighorn-lake-yellowtail/, accessed Oct 13, 2026.
Source: the U.S. Bureau of Reclamation. All Montana lake levels. Readings are provisional and may be revised. About our data and methods.