MontanaReservoir, 564 acres
Helena Valley Reservoir water level
Current level
3,817.55ft above sea level
Reading from Oct 26, 2026
Well above normal for October
- Past 24 hours
- -0.03ft
- Past 7 days
- -0.14ft
- Past 30 days
- -2.09ft
- vs typical October
- +1.55ft
Helena Valley Reservoir was at 3,817.55 ft on October 26, falling 0.14 ft over the past week. That is well above normal for October: the typical October level is 3,816.00 ft, so the lake is 1.55 ft above its usual mark.
Last 30 days
Shaded band shows the lowest and highest October monthly averages on record. Dashed line is the typical October level.
Typical level through the year
Each bar spans the range of monthly averages on record for that month. The line marks the median. The orange dot is where the lake sits now.
Recent daily readings
| Date | Level (ft above sea level) | Change |
|---|---|---|
| Oct 26, 2026 | 3,817.55 | -0.03 |
| Oct 25, 2026 | 3,817.58 | -0.04 |
| Oct 24, 2026 | 3,817.62 | +0.01 |
| Oct 23, 2026 | 3,817.61 | -0.01 |
| Oct 22, 2026 | 3,817.62 | -0.02 |
| Oct 21, 2026 | 3,817.64 | -0.03 |
| Oct 20, 2026 | 3,817.67 | -0.02 |
| Oct 19, 2026 | 3,817.69 | -0.03 |
| Oct 18, 2026 | 3,817.72 | -0.02 |
| Oct 17, 2026 | 3,817.74 | -0.02 |
| Oct 16, 2026 | 3,817.76 | -0.03 |
| Oct 15, 2026 | 3,817.79 | -0.03 |
| Oct 14, 2026 | 3,817.82 | -0.04 |
| Oct 13, 2026 | 3,817.86 | -0.03 |
Reading these numbers
Readings are reservoir surface elevations in feet, as published by the U.S. Army Corps of Engineers. Compare them with ramp and dock elevations from the lake operator to judge whether a launch is usable.
Reservoir levels are managed. Operators lower them ahead of flood season, hold them for summer recreation, and draw them down for dam work. When the lake falls well below its usual level, shallow points and stumps start showing up in places that are normally safe.
High water brings its own problems: floating debris after storms, flooded docks and courtesy piers, and no-wake rules near flooded campgrounds. A quick look at the trend before you hitch up saves a wasted trip.
The gauge is listed by USACE as Helena Valley Reservoir, MT. Wind can pile water up at one end of a big lake for a few hours, so short spikes on a windy day are normal.
Helena Valley Reservoir water level questions
What is the water level at Helena Valley Reservoir today?
Helena Valley Reservoir was at 3,817.55 ft on October 26, falling 0.14 ft over the past week. That is well above normal for October: the typical October level is 3,816.00 ft, so the lake is 1.55 ft above its usual mark.
Is Helena Valley Reservoir high or low right now?
Compared with the long-term record for October, the lake is well above normal. The October monthly average has ranged from 3,814.88 to 3,817.79 ft, with a typical value of 3,816.00 ft.
Is Helena Valley Reservoir rising or falling?
Over the last seven days the level has fallen (-0.14 ft), and it is -2.09 ft compared with 30 days ago.
Where does the Helena Valley Reservoir water level data come from?
From the U.S. Army Corps of Engineers reading at Helena Valley Reservoir, MT. The Corps reports pool elevation, usually every hour, and early values can be revised after review.
How often is this page updated?
The page itself is rebuilt every day with the latest daily values, and the current reading refreshes straight from the Corps of Engineers each time you open it.
Nearby lakes
If Helena Valley is blown out, these are the closest alternatives. Tap through for their water levels.