American Falls Dam
Dam in Power County, Idaho · Snake River · forms American Falls Reservoir
Height
104 ft
32 m (NID height)
Length
5,277 ft
1,608 m
Completed
1927
American Falls Reservoir today
4,314.54 ft
7 days ▲ 3.31 ft
Normal storage
1,671,300 acre-ft
Reservoir level measured Oct 21, 2026, 12:00 AM MDT. Full level page →
Facts
- Purposes
- Flood Risk Reduction; Fire Protection, Stock, Or Small Fish Pond; Fish and Wildlife Pond; Recreation
- Dam type
- Concrete
- Structural height
- 104 ft
- Owner
- BUREAU OF RECLAMATION (Federal)
- Maximum storage
- 1,671,300 acre-ft
- Surface area
- 58,076 acres
- Hydraulic height
- 78 ft
- Drainage area
- 14,560 sq mi
- Spillway
- Controlled, 220 ft wide
- Army Corps district
- Sacramento District
- Also known as
- American Falls Reservoir
- NID ID
- ID00274
Facts from the U.S. Army Corps of Engineers National Inventory of Dams, record updated Oct 6, 2026. Search NID ID ID00274 at nid.sec.usace.army.mil. Project website.