. Water Supply and Irrigation Papers of the United States Geological Survey . Timber, and Sweetgrass rivers have their sources in the Crazy Moun-tains, rising to an elevation of 10,000 feet; the Boulder, Stillwater,and Clark Fork rise on the southeastern slope of the Shoshone Moun-tains at an elevation of 10,500 feet. Powder and Tongue rivers havetheir sources in the high plains region and Bighorn Mountains of Wyo-ming, flowing parallel and in a northeasterly direction until they jointhe Yellowstone. The headwaters of the Yellowstone and many of its tributariesdrain portions of heavily timbere
. Water Supply and Irrigation Papers of the United States Geological Survey . Timber, and Sweetgrass rivers have their sources in the Crazy Moun-tains, rising to an elevation of 10,000 feet; the Boulder, Stillwater,and Clark Fork rise on the southeastern slope of the Shoshone Moun-tains at an elevation of 10,500 feet. Powder and Tongue rivers havetheir sources in the high plains region and Bighorn Mountains of Wyo-ming, flowing parallel and in a northeasterly direction until they jointhe Yellowstone. The headwaters of the Yellowstone and many of its tributariesdrain portions of heavily timbered areas. The Yellowstone, CrazyMountain, Bighorn, and Otter national forests are thus , the greater part of the drainage basin lies within the plainssection and is treeless except for a few willows and cottonwoodsalong the stream channels. The mean annual rainfall in Yellowstone Park is approximately17 inches; at Billings, 15 inches; Glendive, 10 inches; and at Buford a See description of basin on p. 178. U. S. GEOLOGICAL SURVEY ATER-SUPPLY PAPER 246 PLATE V. LOWER FALLS OF THE YELLOWSTONE, YELLOWSTONE NATIONAL PARK. YELLOWSTONE RIVER DRAINAGE BASIN. 143 12^ inches. A greater portion of the rainfall occurs in June. Snowlies in the mountains from November to June. The streams arepartly frozen during the colder months. The great areas of irrigable land and the abundant water supplyafford wonderful opportunities for irrigation in the Yellowstone United States Reclamation Service has practically completedirrigation projects diverting water from the Yellowstone and reclaim-ing 100,000 acres of arid land. The Shoshone project, reclaiming132,000 acres, is partly finished. Several private irrigation projectsare completed and more are under construction. Many possible reservoir sites for the storage of flood water arefound on the upper portion of the Yellowstone and its dam, 325 feet high, on the Shoshone River, stores 456,000acre-feet. The
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