Grand Coulee Dam
Dam in Okanogan County, Washington · Columbia River · forms Franklin D. Roosevelt Lake
Height
550 ft
168 m (NID height)
Length
5,375 ft
1,638 m
Completed
1941
Franklin D. Roosevelt Lake today
1,287.50 ft
7 days ▲ 1.10 ft
Normal storage
9,562,000 acre-ft
Above normal for the date
Reservoir level measured Oct 23, 2026, 10:00 AM PDT. Full level page →
Facts
- Purposes
- Flood Risk Reduction; Irrigation
- Dam type
- Concrete
- Structural height
- 550 ft
- Owner
- BUREAU OF RECLAMATION (Federal)
- Maximum storage
- 9,715,346 acre-ft
- Surface area
- 82,300 acres
- Hydraulic height
- 380 ft
- Drainage area
- 75,117 sq mi
- Spillway
- Controlled, 1,485 ft wide
- Army Corps district
- Seattle District
- Also known as
- Franklin D. Roosevelt Lake
- NID ID
- WA00262
Facts from the U.S. Army Corps of Engineers National Inventory of Dams, record updated Oct 22, 2025. Search NID ID WA00262 at nid.sec.usace.army.mil. Project website.