Yellowtail Dam
Dam in Big Horn County, Montana · Bighorn River · forms Yellowtail Reservoir
Height
525 ft
160 m (NID height)
Length
1,480 ft
451 m
Completed
1966
Yellowtail Reservoir today
3,626.63 ft
7 days ▲ 0.62 ft
vs full pool
▼ 13.37 ft
Normal storage
1,020,573 acre-ft
Below normal for the date
Reservoir level measured Oct 23, 2026, 1:00 PM MDT. Full level page →
Facts
- Purposes
- –
- Dam type
- Concrete
- Structural height
- 525 ft
- Owner
- BUREAU OF RECLAMATION (Federal)
- Maximum storage
- 1,331,725 acre-ft
- Surface area
- 17,958 acres
- Hydraulic height
- 494 ft
- Drainage area
- 19,627 sq mi
- Spillway
- Controlled, 50 ft wide
- Army Corps district
- Omaha District
- Also known as
- Bighorn Lake
- NID ID
- MT00576
Facts from the U.S. Army Corps of Engineers National Inventory of Dams, record updated Oct 22, 2025. Search NID ID MT00576 at nid.sec.usace.army.mil. Project website.