General

• Vicinity Map
• Region (Map) ............ Pacific Northwest
• State (Map) ......................... Washington
• County ......................... Grant, Okanogan
• Project ............................ Columbia Basin
• Dam type ...................... Concrete gravity
• Location .. 28 mi NE of Coulee City, WA
• Watercourse ................... Columbia River
• Reservoir .... Franklin D. Roosevelt Lake
• Original construction .............. 1933-1942
• Modified ................ 1967-1974, 1982-1988
• National ID Number ................ WA00262
• Hydrologic Unit Code ...............

Hydraulics

• Total storage to
    El. 1290 ......................... 9,562,000 acre-ft
• Service spillway
    Capacity at El. 1290 .......... 1,000,000 cfs
• Outlet works
    Capacity at El. 1291.5 .......... 265,000 cfs
• Power outlet capacity ........... 207,000 cfs

Dimensions

• Crest Elevation ............................ 1311.08 ft
• Top of Parapet Elevation ........... 1314.58 ft
• Structural Height ................................ 550 ft
• Hydraulic Height ................................ 380 ft
• Crest Length .................................... 5,223 ft
• Crest Width .......................................... 30 ft
• Base Width ......................................... 500 ft
• Volume of Concrete ........ 11,975,520 cu yd

Hydrology

• Drainage area .......................... 74,100 sq mi
• Hydrometeorological Report ....... HMR 18
• PMF (estimated) .... Snowmelt flood for an
    optimum snowpack and a small rainstorm
    over the basin
• Volume ........................ >125,000,000 acre-ft
    over several months
• Peak inflow ............................. 1,230,000 cfs
• Maximum water surface ................ 1321.8 ft