Upper Stillwater Reservoir Water Level
Utah · updated daily from the U.S. Bureau of Reclamation
8133.61 ft
Upper Stillwater Reservoir is low for this time of year and falling (-5.31 ft in the last 7 days).
Change since yesterday: -0.58 ft
Reading as of 2026-08-13 · higher than 18% of August readings on record
Where Upper Stillwater Reservoir sits historically
Today's level compared with every reading in our 5.5-year record for this lake.
Since yesterday
-0.58 ft
7-day change
-5.31 ft
30-day change
-13.94 ft
1-year change
-12.14 ft
Last 30 days
Last 12 months
Full history (5.5 years)
Upper Stillwater Reservoir records and averages
| Current level | 8133.61 ft |
|---|---|
| Record high | 8172.56 ft (2023-06-19) |
| Record low | 8027.02 ft (2021-04-01) |
| Average of all readings | 8111.45 ft |
| Data span | 5.5 years (2,000 readings) |
Frequently asked questions
Is Upper Stillwater Reservoir full right now?
As of 2026-08-13, Upper Stillwater Reservoir sits at 8133.61 ft, which is low for this time of year.Over the past 30 days the level has fallen 13.94 ft.
What is the water level at Upper Stillwater Reservoir today?
The most recent reading is 8133.61 ft (2026-08-13), sourced from the U.S. Bureau of Reclamation. Readings on this page refresh automatically as the agency publishes new data.
What is the highest Upper Stillwater Reservoir has ever been?
The highest level in our records is 8172.56 ft on 2023-06-19. The lowest is 8027.02 ft on 2021-04-01. Our record covers about 5.5 years of readings.
Is Upper Stillwater Reservoir low for this time of year?
Compared with every August in our records, the current level is higher than 18% of them — 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 Upper Stillwater 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. Upper Stillwater Reservoir has fallen 13.94 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 Upper Stillwater Reservoir changed over the past year?
The level is -12.14 ft compared with this date last year (8133.61 ft today). The full-history chart above covers 5.5 years, with a record high of 8172.56 ft and a record low of 8027.02 ft.
Nearby lakes in Utah
Source: the U.S. Bureau of Reclamation. Readings are provisional and subject to revision by the publishing agency. All Utah lake levels.