General

• Vicinity Map
• Region (Map) ....................... Great Plains
• State (Map) ............................... Montana
• County ............... Teton, Lewis and Clark
• Project ....................................... Sun River
• Dam type ................. Concrete thick arch
• Location ..... 30 mi NW of Augusta, MT
• Watercourse ... North Fork of Sun River
• Reservoir ....................................... Gibson
• Original construction .............. 1926-1929
• Modified ............................................ 1938
• National ID Number ................ MT00571
• Hydrological Unit Code ...................

Hydraulics

• Total storage to
    El. 4724 .............................. 99,100 acre-ft
• Service spillway
    Capacity at El. 4724 ............... 30,000 cfs
• Outlet works
    Capacity at El. 4724 ................. 3,050 cfs

Dimensions

• Crest Elevation .............................. 4725.5 ft
• Structural Height ................................ 199 ft
• Hydraulic Height ................................ 195 ft
• Crest Length ....................................... 960 ft
• Crest Width ........................................... 15 ft
• Base Width ............................................ 87 ft
• Volume of Concrete ............. 167,500 cu yd

Hydrology

• Drainage area ............................... 575 sq mi
• Hydrometeorological Report ........ HMR
• PMF ..........
• Volume .............
• Peak inflow ...........
• Maximum water surface .....