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General
Vicinity Map
Region (Map) ....................... Great Plains
State (Map) ............................... Montana
County ....................................... Big Horn
Project ........................ PSMBP-Yellowtail
Dam type ............... Composite concrete gravity
overflow structure with embankment wings
Location .......... 47 mi SW of Hardin, MT
Watercourse ..................... Bighorn River
Reservoir .................. Yellowtail Afterbay
Original construction .............. 1964-1966
National ID Number ................. MT00582
Hydrologic Unit Code .................. |
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Hydraulics
Total storage to
El. 3192.0 ............................. 3,140 acre-ft
Service spillway
Capacity at El. 3192.0 ............ 24,500 cfs
Outlet works (sluiceway)
Capacity at El. 3192.0 .............. 4,500 cfs
Canal headworks
Capacity at El. 3192.0 ................. 750 cfs |
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Dimensions
Crest Elevation
Concrete Overflow Section ...... 3206.27 ft
Embankment Wings .................. 3197.50 ft
Structural Height .................................. 72 ft
Hydraulic Height .................................. 36 ft
Crest Length .................................... 1,425 ft
Crest Width
Concrete Overflow Section ................48 ft
Embankment Wings .......................... 28 ft
Base Width
Concrete Overflow Section ............. 106 ft
Embankment Wings ......................... 250 ft
Volume of Concrete ............... 21,600 cu yd
Volume of Embankments ..... 162,000 cu yd |
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Hydrology
Drainage area .......................... 19,848 sq mi
Hydromeotorological Report ............... NA
PMF ...... 1988 Rain-on-100-year snow general storm
Volume ......................................... Unknown
Peak inflow ................................. 614,000 cfs
Outflow from Yellowtail Dam, 2.2 mi upstream
Maximum water surface ................ 3223.9 ft |
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