Helena Valley Reservoir Water Level
Montana · updated daily from the U.S. Bureau of Reclamation
3817.60 ft
Helena Valley Reservoir is above average for this time of year and falling (-0.41 ft in the last 7 days).
Change since yesterday: +0.08 ft
Reading as of 2026-08-14 · higher than 73% of August readings on record
Where Helena Valley Reservoir sits historically
Today's level compared with every reading in our 5.5-year record for this lake.
Since yesterday
+0.08 ft
7-day change
-0.41 ft
30-day change
-2.04 ft
1-year change
+1.38 ft
Last 30 days
Last 12 months
Full history (5.5 years)
Helena Valley Reservoir records and averages
| Current level | 3817.60 ft |
|---|---|
| Record high | 3820.0 ft (2023-07-02) |
| Record low | 3810.62 ft (2025-04-15) |
| Average of all readings | 3816.13 ft |
| Data span | 5.5 years (2,000 readings) |
Frequently asked questions
Is Helena Valley Reservoir full right now?
As of 2026-08-14, Helena Valley Reservoir sits at 3817.60 ft, which is above average for this time of year.Over the past 30 days the level has fallen 2.04 ft.
What is the water level at Helena Valley Reservoir today?
The most recent reading is 3817.60 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 Helena Valley Reservoir has ever been?
The highest level in our records is 3820.0 ft on 2023-07-02. The lowest is 3810.62 ft on 2025-04-15. Our record covers about 5.5 years of readings.
Is Helena Valley Reservoir low for this time of year?
Compared with every August in our records, the current level is higher than 73% of them — above average 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 Helena Valley 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. Helena Valley Reservoir has fallen 2.04 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 Helena Valley Reservoir changed over the past year?
The level is +1.38 ft compared with this date last year (3817.60 ft today). The full-history chart above covers 5.5 years, with a record high of 3820.0 ft and a record low of 3810.62 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.