General

• Vicinity Map
• Region (Map) ....................... Great Plains
• State (Map) ............................... Montana
• County ........................... Lewis and Clark
• Project ................. PSMBP-Canyon Ferry
• Dam type ...................... Concrete gravity
• Location ...... 17 miles NE of Helena, MT
• Watercourse ................... Missouri River
• Reservoir .................. Canyon Ferry Lake
• Original construction ............. 1949-1954
• National ID Number .................MT00568
• Hydrological Unit Code ..............

Hydraulics

• Total storage to
    El. 3800 ......................... 2,050,900 acre-ft
• Service spillway
    Capacity at El. 3800 ............. 150,000 cfs
• Outlet works
    Capacity at El. 3800 ................. 9,720 cfs
• Downstream safe channel
    capacity ................................... 15,000 cfs

Dimensions

• Crest Elevation .............................. 3808.5 ft
• Top of parapet elevation ............ 3810.69 ft
• Structural Height ................................ 225 ft
• Hydraulic Height ................................ 165 ft
• Crest Length .....................................1,000 ft
• Crest Width .......................................... 20 ft
• Base Width ......................................... 173 ft
• Volume of Concrete ............. 349,500 cu yd

Hydrology

• Drainage area .......................... 15,860 sq mi
• Hydrometeorological Report ....... HMR 55
• PMF .............................. 1985 General storm
• Volume ... 2,035,000 acre-feet over 15 days
• Peak inflow ................................ 506,000 cfs
• Maximum water surface .............. 3812.66 ft