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General
Vicinity Map
Region (Map) ............. Pacific Northwest
State (Map) ..................................... Idaho
County ................................ Boise/Elmore
Project .............................................. Boise
Dam type ................. Concrete thick arch
Location ................... 13 mi E of Boise, ID
Watercourse ......................... Boise River
Reservoir ................................. Arrowrock
Original construction .............. 1911-1915
Modified ................................... 1935-1937
National ID Number ................... ID00280
Hydrologic Unit Code ............. |
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Hydraulics
Total storage to
El. 3216 ............................ 286,600 acre-ft
Service spillway
Capacity at El. 3219.75 .......... 40,000 cfs
Outlet works capacity:
Upper ten outlets at El. 3216 .. 10,230 cfs
Lower nine outlets at El. 3118 .. 7,770 cfs
Five sluice outlets at El. 3018 ... 4,670 cfs |
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Dimensions
Crest Elevation .............................. 3216.0 ft
Top of Parapet Elevation ........... 3219.75 ft
Structural Height ................................ 350 ft
Hydraulic Height ................................ 257 ft
Crest Length .................................... 1,150 ft
Crest Width ....................................... 15.5 ft
Base Width ......................................... 223 ft
Volume of Concrete ............. 636,000 cu yd |
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Hydrology
Drainage area ............................ 2,210 sq mi
Hydrometeorological Report ....... HMR 43
PMF ............................. 1983 Rain-on-snow
Volume ...... 664,300 acre-feet over 15 days
Peak inflow ................................ 124,156 cfs
Maximum water surface ................ 3224.1 ft |
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