Identifier: watersupplyirrig245unit (find matches)
Title: Water Supply and Irrigation Papers of the United States Geological Survey
Year: 1910 (1910s)
Authors: United States Geological Survey
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Contributing Library: Clemson University Libraries
Digitizing Sponsor: LYRASIS Members and Sloan Foundation

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a great part of the area lies within the arid andsemiarid regions, and it is probable that the annual average precipi-tation throughout the entire basin is less than 20 inches. The tributaries are mostly in the upper course of the river and fromthe western side of the basin. The most important of these areMusselshell, Sun, Marias, Milk, Yellowstone, Cheyenne, Platte, andKansas rivers. Owing to the high altitude and northern climate ice conditions pre-vail in the upper portions of this basin from November to April.The Missouri itself freezes over entirely, but many of its tributariesremain partly open on account of the extreme rapidity of the water.The amount of snow falling on the prairies is usually small, butamong the mountains the snows begin early, continue late, and accu-mulate to great depths. Irrigation is practiced to a great extent on the various tributariesof the Missouri and agriculture has been extensively developed in S. GEOLOGICAL SURVEY WATER-SUPPLY PAPER 246 PLATE III
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KEPLER CASCADE, FIREHOLE RIVER, YELLOWSTONE NATIONAL PARK. MISSOURI RIVER. 31 many of the valleys. The Madison and Gallatin and many other ofthe mountain tributaries afford unsurpassed storage facilities, thewaters of the Beaverhead, Big Hole, Madison, Jefferson, and Gallatinrivers furnish great supplies for irrigation, and the basins of Milk,Sun, Yellowstone, and Musselshell rivers, already extensively util-ized, still offer opportunities for broader irrigation, storage, andwater-power development. (See Pis. Ill and XIII.) MISSOURI RIVER PROPER. DESCRIPTION. Missouri River proper is formed in southwestern Montana by theunion of three streams, which were discovered by Lewis and Clarkin 1806 and named by them Jefferson, Madison, and Gallatin rivers.Jefferson and Madison forks come together first, and within 2 milesthey are joined by the Gallatin. The head of the Missouri thus formedlies in about latitude 45° 56 north and longitude 111 ° 32 west. Eachof the three headwater rivers is a

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