Helena Valley Dam
Dam in Lewis and Clark County, Montana · Tenmile Creek Tr · forms Helena Valley Reservoir
Height
94 ft
29 m (NID height)
Length
1,900 ft
579 m
Completed
1959
Helena Valley Reservoir today
3,817.63 ft
7 days ▼ 0.17 ft
Normal storage
10,451 acre-ft
Reservoir level measured Oct 21, 2026, 12:00 AM MDT. Full level page →
Facts
- Purposes
- Irrigation; Water Supply
- Dam type
- Earth
- Structural height
- 94 ft
- Owner
- BUREAU OF RECLAMATION (Federal)
- Maximum storage
- 10,702 acre-ft
- Surface area
- 531 acres
- Hydraulic height
- 65 ft
- Drainage area
- 3 sq mi
- Spillway
- None
- Army Corps district
- Walla Walla District
- Also known as
- Helena Valley Reservoir
- NID ID
- MT00743
Facts from the U.S. Army Corps of Engineers National Inventory of Dams, record updated Oct 22, 2025. Search NID ID MT00743 at nid.sec.usace.army.mil. Project website.
Other dams at Helena Valley Reservoir
- Helena Valley Dike