U.S. Department of the Interior Rogers C. B. Morton, Secretary, Bureau of Reclamation, Gilbert G
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U.S. Department of the Interior Rogers C. B. Morton, Secretary, Bureau of Reclamation, Gilbert G. Stamm, Commissioner At the base of the dam the Montana Power Co. Bighorn Lake will sugar beets, beans, Municipal and Industrial Brown and rainbow which includes a special a powerplant occupies Power can also be provide a high-level alfalfa, and irrigated Water trout and walleye pike are wildlife area located along nearly the entire width of delivered to the Bureau's diversion for the future pasture. During the most popular sport the Shoshone River and the riverbed. The plant eastern system by the 230 irrigation of the 43,550- construction of the dam, Expanding requirements fish in Bighorn Lake. managed by the Wyoming houses four 62,500- kilovolt line to the acre Hardin Unit and provisions were made for for all types of energy Trout predominate in the Game and Fish kilowatt generating units, Dawson County substation river-level diversion for irrigation service by are focusing attention Afterbay Reservoir and in Commission. driven by four 87,500- near Glendive, Mont. smaller units further incorporating into the upon the vast coal the Bighorn River for Bighorn Lake area has horsepower turbines Production at the 250,000- downstream. The structure the beginning of deposits in the Northern several miles downstream. a tremendous potential producing an average of kilowatt plant is fully .potentially irrigable Hardin a system that will allow Great Plains. About 40 Fishing is outstanding on for waterfowl and upland about 1 billion kilowatt- integrated with the more Unit area—now primarily delivery of water to lands percent of the Nation's a year-round basis in the game-bird hunting and is hours of energy annually. than 2,490,000 kilowatts dryfarmed for wheat or which lie on two benches coal resources are located river below the Afterbay considered the top upland Water power is supplied of hydropower capacity at native pasture—lies largely above the river. A 9V2- in the area, with huge Dam. Big game in the game-bird area in to each unit by separate other Federal in a strip of land 2 to 3 foot tunnel inlet structure reserves of mineable coal. area include whitetail and Wyoming. Pheasant, This low-sulfur coal is mule deer, antelope, and 12-foot-diameter penstocks developments in the miles wide, commencing takes off about 365 feet 4 chukar and Hungarian through the dam. Missouri River Basin. about IV2 miles below above the bottom of the suitable for thermal- elk. The Pryor Mountain partridge, sage grouse, electric power generation coordination between On the east rim of the More than 10,600 miles of the dam and extending dam and runs 250 feet wild horse range adjoins sharptail grouse, and wild Federal transmission lines 40 miles downstream into the canyon wall. and for conversion to Federal, State, and local the area on the west near turkey are available. canyon, high above the synthetic pipeline gas or interests will be necessary dam, is the switchyard carry this power to major along the west side of When irrigation is the Montana-Wyoming Waterfowl include Canada wholesale load centers for the Bighorn River. developed, the tunnel will liquid fuels. Water is to balance environmental, border. geese and mallards, plus through which electrical essential to the social, economic, and further distribution by Future irrigation will be extended for nearly Outdoor recreationists blue-wing and green-wing power and energy is conversion of coal, and a energy needs. local suppliers to the permit diversified IV2 miles to connect with will find that Yellowtail teal, and many shore delivered to the Bureau substantial volume can farms, homes, and cities agricultural production a pumping plant. provides natural habitat, birds. You are welcome of Reclamation's Missouri probably be made Flood Control of the basin. including such crops as Hydraulic turbines food sources, and nesting to fish, hunt, observe, River Basin power system. available from Bighorn powered by water Regulation of the erratic and resting areas for a photograph, and enjoy the Power is transmitted from Lake each year for released from the and widely fluctuating large and varied wildlife and fishery at the plant to the industrial purposes. switchyard by insulated reservoir will drive the flows of the Bighorn population of upland Yellowtail. cables enclosed in two pumps. About one-third of Major oil companies are River to alleviate flood game birds and waterfowl. 1,800-foot-long the water will be lifted to examining the potential of damage is an important Photographers and underground, oil-filled, higher benchlands, and this tremendous energy function of the Yellowtail amateur and professional high-pressure pipes. the remainder will flow by reserve. Since 1967, Unit. The spring runoff bird watchers alike will gravity through a canal options have been let on find a variety of Power delivery from the from snowmelt in the system to irrigate lower water service contracts waterfowl, songbirds, and switchyards can be made mountains and flash benchlands. covering 623,000 acre-feet shore birds on the unit, to the western area storms sometimes reaches Storage and regulation of water annually. This flood proportions, and it systems with the Bureau's includes 110,000 acre-feet 115 kilovolt lines to of water provided by is estimated that Yellowtail is the key to of water that have been Yellowtail Dam will reduce Wyoming and by a 230 reserved for development kilovolt interconnection to future irrigation average annual flood development of the lower of coal resources located damages by $323,000. the systems of the Pacific on Crow Indian Power and Light Co., and Bighorn Basin. During the flood of 1967, Reservation lands. storage in Bighorn Lake Use of water prevented flood damages 1. Interior of the 250.000-kW power- impounded in Bighorn plant of more than $1.4 million, 2 Visitor center near dam. Lake is subject to terms and by 1973 the reservoir 3 Scenic Bighorn Canyon about 15 of the Yellowstone River had prevented more than miles upstream from dam. Compact and provisions $3.6 million in flood 4 New visitor center located 500 feet of the National above the Bighorn River. damages. 5. Wildlife in the Bighorn Lake area Environmental Policy Act 1 of 1969. The magnitude of the Nation's energy needs and the large 5 potential for creating energy-producing systems within the region magnify 3 the need for orderly development. Close 2 Fish& Rower Irrigation Water Wild Life The dam, reservoir, and A Pick-Sloan Missouri Dam: surrounding area create a Basin Program Unit playground paradise Type Concrete arch Height above foundation (feet) providing great The Yellowtail Unit is 525 opportunity for public use located on the Bighorn Crest length (feet) 1,480 Crest width (feet) and enjoyment. A myriad River in southcentral 22 of activities associated Montana, about 43 air Crest elevation (feet) 3,660 with the outdoors is miles southeast of Base thickness at center of arch (feet) About 145 available throughout a Billings. Construction has Volume (cubic yards) 1,546,000 rugged and colorful area. Spillway: 32-foot-diameter tunnel in left abutment, con been carried out as part trolled by two radial gates 25 feet wide by 64.4 feet The reservoir is a deep of the Pick-Sloan Missouri high. Discharge capacity at water surface elevation 71-mile-long blue-water Basin Program—an overall 3,660 (cubic feet per second) 92,000 lake having a magnificent plan to utilize the waters and exciting 195-mile Outlet works: of the Missouri River River outlets—Two 84-inch-diameter cond> jits through shoreline. Surrounding the Basin. Key feature of the dam, controlled by 84-inch-diameter i ing-follower reservoir are uplifted unit is Yellowtail Dam, gates. Discharge capacity (cubic feet per second) 5,000 mountains—the Bighorns which rises 525 feet to the east and Pryors to Power outlets—Four 1 2-foot-diameter penstocks between the rugged through dam. the west—with upland Bighorn Canyon walls. prairie between them. The dam, a tall, variable- Through this beautiful thickness arch type, is Reservoir (Bighorn Lake): grassland the Bighorn the highest in the River has carved a Missouri River Basin and Capacity (acre-feet at elevation 3.657) 1,375,000 narrow and precipitous creates one of the largest Area (acres at elevation 3,657) 17,300 gorge, dropping in some reservoirs in capacity— Length (river miles at elevation 3.657) 71 cases 2,200 feet from 1,375,000 acre-feet—on Water surface elevation (joint-use storage) 3,614 to 3,640 prairie to river level. The Water surface elevation (flood-control storage) 3,640 to 3,657 people—are to be seen in including nearby caves. A Bighorn Canyon National the tributary system of lake covers portions of several areas of this visitor center near the Recreation Area, the Missouri River. Montana and Wyoming, outdoor playground. dam provides parking administered by the Powerplant: and the lower 47 miles The reservoir, named areas, rest facilities, a National Park Service. are within the spectacular The use of the reservoir Bighorn Lake, is utilized Indoor-type, housed in structural-steel framework building faced with brick. public information center Boat-launching ramps, Vertical-shaft generators direct-connected to Francis-type turbines. Bighorn Canyon. A visitor and surrounding lands is for the generation of including dioramic camping and picnicking Total nameplate capacity (kilowatts) 250,000 is rewarded with unusually diversified. power, irrigation, exhibits related to the facilities, comfort stations, Number of units magnificent scenery Water-related activities recreation, enhancement 4 construction of the dam, and parking areas are Capacity each generator (kilowatts) 62,500 around every turn of a constitute the basic of fish and wildlife, historical displays, and available at the Afterbay Capacity each turbine (horsepower) 87,500 vari-colored canyon that attraction, and there are sediment retention, audiovisual presentations Dam, Ok-a-beh, Barry's serves as a beautiful outstanding opportunities municipal and industrial of areas of interest.