Wanapum
Dam in Kittitas County, Washington · Columbia River · forms Wanapum Lake
Height
206 ft
63 m (NID height)
Length
8,639 ft
2,633 m
Completed
1965
Wanapum Lake today
567.69 ft
7 days ▲ 0.96 ft
Normal storage
590,000 acre-ft
Normal for the date
Reservoir level measured Oct 23, 2026, 10:00 AM PDT. Full level page →
Facts
- Purposes
- Hydroelectric; Recreation; Flood Risk Reduction
- Dam type
- Gravity
- Structural height
- 206 ft
- Owner
- Grant County PUD (Public Utility)
- Maximum storage
- 796,000 acre-ft
- Surface area
- 14,590 acres
- Hydraulic height
- 80 ft
- Drainage area
- 95,000 sq mi
- Spillway
- Controlled, 832 ft wide
- Army Corps district
- Seattle District
- Also known as
- Wanapum (Res)
- NID ID
- WA00085
Facts from the U.S. Army Corps of Engineers National Inventory of Dams, record updated Aug 26, 2026. Search NID ID WA00085 at nid.sec.usace.army.mil. Project website.