Page 1 Page 2 Page 3 Page 4 Page 5 Page 6 Page 7 Page 8 Page 9 Page 10 Page 11 Page 12 Page 13 Page 14 Page 15 Page 16 Page 17 Page 18 Page 19 Page 20 Page 21 Page 22 Page 23 Page 24 Page 25 Page 26 Page 27 Page 28 Page 29 Page 30 Page 31 Page 32 Page 33 Page 34 Page 35 Page 36 Page 37 Page 38 Page 39 Page 40 Page 41 Page 42 Page 43 Page 44 Page 45 Page 46 Page 47 Page 48 Page 49 Page 50 Page 51 Page 52 Page 53 Page 54 Page 55 Page 56 Page 57 Page 58 Page 59 Page 60Lake or reservoir Perennial stream Intermittent stream One acre-foot/year is equivalent to the water usage of an average suburban family in one year. Peak flow or daily flow are often measured in cubic feet per second. Wyoming's largest rivers Acre feet / year (volume) Snake River (Salt and Grey Rivers) 4,498,980 Bighorn River (Wind and Shoshone Rivers) 2,435,679 Yellowstone River 2,244,419 Green River (Blacks Fork River) 1,469,956 North Platte River (Laramie River) 1,409,608 Missouri Headwaters (Madison and Gallatin Rivers) 943,264 Clarks Fork River 671,080 Little Snake River 371,655 Bear River 360,063 Powder River 316,595 Major streams, lakes, and reservoirs 14 Yellowstone Lake is the largest freshwater mountain lake above 7,000 feet in North America. In addition to the streams, lakes, and reservoirs shown,Wyoming’s water resources also include groundwater, precipitation (rain, sleet, hail, and snow), snow fields, and glaciers. Snow melting in the mountains in April, May, June, and early July is a major source of water not only for Wyoming but also for other states that depend on water flowing in streams from Wyoming. Dams are used to store water in reservoirs for the summer and fall months when there is limited rainfall in Wyoming’s large dry basins and plains. Stored water is used for human and livestock consumption, irrigation for agriculture, industrial purpose, and for generating hydroelectricity. Sweetwater River S m i t h ' s F o r k Shoshone River N orth Platte River Laramie P o w d e r R i v e r Cheyenne River Belle Four c h e R i v e r Little Snake River Flaming Gorge Reservoir Yellowstone Lake Jackson Lake Pathfinder Reservoir Seminoe Reservoir Boysen Reservoir Glendo Reservoir Fontenelle Reservoir Buffalo Bill Reservoir Ocean Lake Yellowstone River W ind River River Snake River Green River Big Horn River B e a r River Data Go Interactive