Garrison Dam
Dam in Mercer County, North Dakota · Missouri River · forms Garrison Reservoir
Height
210 ft
64 m (NID height)
Length
11,300 ft
3,444 m
Completed
1953
Garrison Reservoir today
1,823.92 ft
7 days ▼ 0.13 ft
vs full pool
▼ 13.58 ft
Normal storage
18,500,000 acre-ft
Below normal for the date
Reservoir level measured Oct 23, 2026, 7:00 AM CDT. Full level page →
Facts
- Purposes
- Hydroelectric; Irrigation; Navigation; Recreation; Flood Risk Reduction
- Dam type
- Earth
- Structural height
- 210 ft
- Owner
- USACE - Omaha District (Federal)
- Maximum storage
- 26,000,000 acre-ft
- Surface area
- 133,000 acres
- Hydraulic height
- 180 ft
- Drainage area
- 180,940 sq mi
- Spillway
- Controlled, 1,336 ft wide
- Army Corps district
- Omaha District
- Also known as
- Lake Sakakawea
- NID ID
- ND00145
Facts from the U.S. Army Corps of Engineers National Inventory of Dams, record updated Jan 8, 2026. Search NID ID ND00145 at nid.sec.usace.army.mil. Project website.