Gibson Reservoir Water Level
Montana · updated daily from the U.S. Bureau of Reclamation
4664.82 ft
Gibson Reservoir is high for this time of year and falling (-15.88 ft in the last 7 days).
Change since yesterday: -1.70 ft
Reading as of 2026-08-14 · higher than 81% of August readings on record
Where Gibson Reservoir sits historically
Today's level compared with every reading in our 5.3-year record for this lake.
Since yesterday
-1.70 ft
7-day change
-15.88 ft
30-day change
-52.50 ft
1-year change
+54.31 ft
Last 30 days
Last 12 months
Full history (5.3 years)
Gibson Reservoir records and averages
| Current level | 4664.82 ft |
|---|---|
| Record high | 4724.06 ft (2021-06-15) |
| Record low | 4607.1 ft (2025-02-19) |
| Average of all readings | 4647.7 ft |
| Data span | 5.3 years (2,000 readings) |
Frequently asked questions
Is Gibson Reservoir full right now?
As of 2026-08-14, Gibson Reservoir sits at 4664.82 ft, which is high for this time of year.Over the past 30 days the level has fallen 52.50 ft.
What is the water level at Gibson Reservoir today?
The most recent reading is 4664.82 ft (2026-08-14), sourced from the U.S. Bureau of Reclamation. Readings on this page refresh automatically as the agency publishes new data.
What is the highest Gibson Reservoir has ever been?
The highest level in our records is 4724.06 ft on 2021-06-15. The lowest is 4607.1 ft on 2025-02-19. Our record covers about 5.3 years of readings.
Is Gibson Reservoir low for this time of year?
Compared with every August in our records, the current level is higher than 81% of them — 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 Gibson Reservoir low 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. Gibson Reservoir has fallen 52.50 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 Gibson Reservoir changed over the past year?
The level is +54.31 ft compared with this date last year (4664.82 ft today). The full-history chart above covers 5.3 years, with a record high of 4724.06 ft and a record low of 4607.1 ft.
Nearby lakes in Montana
Source: the U.S. Bureau of Reclamation. Readings are provisional and subject to revision by the publishing agency. All Montana lake levels.