Thompson Falls - Main Channel Dam
Dam in Sanders County, Montana · Clark Fork River, Pend Oreille · forms Thompson Falls Lake
Height
54 ft
16 m (NID height)
Length
1,016 ft
310 m
Completed
1915
Thompson Falls Lake today
2,396.11 ft
7 days ▼ 0.24 ft
Normal storage
14,970 acre-ft
Normal for the date
Reservoir level measured Oct 23, 2026, 12:00 AM MDT. Full level page →
Facts
- Purposes
- Hydroelectric
- Dam type
- Gravity
- Structural height
- 54 ft
- Owner
- Private
- Maximum storage
- 24,450 acre-ft
- Surface area
- 1,580 acres
- Hydraulic height
- 50 ft
- Drainage area
- 21,113 sq mi
- Spillway
- Controlled
- Army Corps district
- Seattle District
- NID ID
- MT00224
Facts from the U.S. Army Corps of Engineers National Inventory of Dams, record updated Aug 26, 2026. Search NID ID MT00224 at nid.sec.usace.army.mil. Project website.
Other dams at Thompson Falls Lake
- Thompson Falls - Intake Dam B
- Thompson Falls - Intake Dam A
- Thompson Falls - Dry Channel Dam