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North Platte Project
<br />Climatic Conditions Dimensions Dam Dike
<br />Structural height. . 214 ft 38 ft
<br />Annual precipitation ..................... 13.6 in Hydraulic height ................... 192 ft 20 ft
<br />Temperature: Top width ........................ 10.9 ft 20 ft
<br />Maximum .............................. 106 OF Maximum base width ................ 97 ft 210 ft
<br />Minimum .............................. —22 OF Crest length ....................... 432 ft 1,650 ft
<br />Mean ... ............................... 51 OF Crest elevation .................. 5858.1 ft 5868.1 ft
<br />Growing season .......................... 150 days Volume.........:............. 65,700 yd3 152,000 yd3
<br />Elevation of irrigable area ................. 4000.0 ft Spillway: Uncontrolled, flat- crested weir in
<br />left abutment of dam.
<br />Settlement Crest length ............................. 583 ft
<br />Crest elevation .......................... 5850.1 ft
<br />Number of persons served with project water Capacity at El. AM. 16t ................... 65,000 ft3 /8
<br />(1977): Outlet works: Tunnels through abutment.
<br />Farm irrigation service .................... 10,553 North outlet is controlled by two 58 -in
<br />needle valves; sluicing outlet is provided.
<br />Capacity:
<br />Aiorth out 5818 ................... 1P
<br />Power Generation Foundation: Coarse- grained, massive granite;
<br />local vertical crush zone at left abutment;
<br />Guernsey some flat mud seams in canyon floor.
<br />Powerplant,' Total,
<br />Fiscal year kWh kWh GU X ]PAM
<br />1968 26,719,000 26,719,000
<br />1969 26,327,000 26,327,000 Type: Diaphragm type earthf ill
<br />1970 25,021,000 25,021,000 Location: On North Platte River near Guern-
<br />1971 27,202,000 27,202,000 sey, Wyo.
<br />1972 32,725,000 32,725,000 Construction period: 1925 -27
<br />1973 27,158,000 27,158,000 Reservoir, Guernsey:
<br />1974 32,557,000 32,557,000 Av6raga. annual inflow .................... 1,101,200 acre -ft.
<br />1975 23,927,000 23,927,000 Total capacity ........................... eft
<br />1976 25,374,000 25, 374, 000 A ive: axalty,El.4420 .....:.:....•,, 45,2�$,aq[e -ft
<br />1977 21,330,000 21,330,000 Inactive storage below El. 4370 ............. 105 acre -ft
<br />Surface area at El. 4420 ................... 2,380 acres
<br />2Operation of Lingle Powerplant discontinued after May 1, 1956. Dimensions:
<br />• Structural height ......................... 135 ft
<br />Hydraulic height . 92 ft
<br />ENGINEERING DATA Top width .............................. 25.3 ft
<br />Maximum base width ..................... 940 ft
<br />Water Supply Crest length ............................. 560 ft
<br />Crest elevation . ......................... 4430.0 ft
<br />N, IVGR Total volume ............................ 586,000 yd3
<br />Spillways: Concrete -lined open channel in
<br />Dr ' waa,at Whalen ..... , ..... -r. 16,300 -mi3„ north abutment, controlled by a 50 -ft-
<br />Annual discharge at Whalen: square Stoney gate; morning -glory inlet
<br />Maximum (1917) ........................ 2,170,000 acre -ft and vertical shaft in south abutment
<br />Minimum (1940) ......................... 183,700 acre -ft leading to concrete -lined combination
<br />Average 693,600' acr , spillway and outlet tunnel, controlled by
<br />g two 64- by 14.5 -ft drum gates.
<br />NORTH PLATTE RIVER North South
<br />Elevation top of gates ............ 4420.0 ft 4420.0 ft
<br />Drainage area at Pathfinder ............... 10,700 mil Crest elevation .................. 4370.0 ft 4405.5 ft
<br />Annual discharge at Pathfinder: Y *GcFq1, 442 • .. , , - 50,000 W/o 25,800 , ft*a
<br />Maximum (1909) ........................ 2,230,000 acre -ft Outlet works: Vertical shaft from 20- by 26 -ft
<br />Minimum (1934) ......................... 485,400 acre -ft Stoney intake gate, controlled by three
<br />Average 1;168,400 acre4t 5-ft- square high - pressure slide gates
<br />for sluicing in spillway - outlet tunnel; for
<br />Storage Facilities power, 12 -ft concrete -lined tunnel 662 ft
<br />long branching from spillway - outlet tunnel,
<br />PATHFINDER DAM AND DIKE controlled by the intake gate.
<br />Type: Masonry arch. Dike is a homogeneous MINATARE DAM
<br />earthfill structure.
<br />Location: On North Platte River, 47 mi south- Type: Zoned earthf ill, concrete paving on
<br />west of Casper, Wyo. Dike is about 0.25 upstream slope
<br />mile south of dam. Location: Off stream about 11 mi northeast
<br />Construction period: 1905 -09. South outlet of Gering, Nebr.
<br />constructed in 1910 -12; north outlet Gaqs&wgion period: 19M I&
<br />reconstructed in 1919 -21. Reservoir, Lake Minatare: Inflows are from
<br />Reseggir,RAthfinder: canal, controlled by releases from Guernsey
<br />A�6 a annual inflow .................... 1,153,100 acre -ft,. Reservoir.
<br />Total capacity ........................... 1.014 &0 „acre -ft Total capacity ........................... '8M d00 acre -ft
<br />Au.&e phcity, El 5850.1 f ............... acre -ft A,cA &,dtTp y,'EL` 41253 ......:.:`:....... t f re+it
<br />Inactive capacity, P1. 5725 ................ 5,000 acre -ft
<br />Surface area at El. 5850.1 ................. 22,012 acres 'Includes 2,000 acre -ft of storage capacity in Lake Winters Creek.
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