MontanaReservoir, 564 acres
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3,817.55ft
Down 0.14 ft this week
Sailing
CheckingReading the forecast
Kayak and SUP
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Power boating
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Fishing
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Outlook. Monday: SE wind 2 to 4 kt, gusts to 11 kt, high near 48°F. Tuesday: SW wind 6 to 13 kt, gusts to 24 kt, high near 49°F.
7-day wind forecastLoads when you scroll here
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Last hour of NOAA MRMS radar, 1 km resolution. Map data © OpenStreetMap contributors, OpenMapTiles, OpenFreeMap.
3,817.55ft above sea level
-0.14 ft in 7 days1.55 ft above the October normal
Reading from Oct 26, 2026. Shaded band: range of October averages on record; dashed line is the typical level.
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.
Background reading: Helena Valley Reservoir on Wikipedia
Set in Montana, Helena Valley Reservoir is a 564-acre reservoir.
Water level on this page comes from the U.S. Army Corps of Engineers reading at Helena Valley Reservoir, MT, published through the Corps' CWMS data service. Wind, gusts and rain come from the National Weather Service forecast grid that covers the water.
Small lakes rarely build big waves, but trees and hills around the shore make the wind patchy. Expect sudden puffs and lulls rather than a steady breeze. Reservoir levels move with releases and inflow, so ramps and beaches can change week to week. The water level page tracks that day by day.
The go or no-go calls above are a starting point, not a guarantee. Read how we score conditions, and always check local rules and posted warnings before you launch.
The National Weather Service forecast for the lake from October 26: Monday: SE wind 2 to 4 kt, gusts to 11 kt, high near 48°F. The panel at the top of this page refreshes the current wind, gusts and direction when you open it and turns them into a call for sailing, paddling, power boating and fishing.
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.
Helena Valley Reservoir covers about 564 acres (0.9 square miles) of surface water.
If Helena Valley is blown out, these are the closest alternatives. Tap through for their conditions.