Straddling the Continental Divide, Wyoming is a source area for the waters of the four main drainage systems of the western United States: the Missouri-Mississippi; the Interior, or Great Basin; the Columbia; and the Colorado. Rivers joining the Missouri include the Yellowstone, Bighorn, Powder, and Belle Fourche rivers, which flow north, and the North Platte River, with such tributaries as the Sweetwater and Laramie rivers, which flow east. The Green River, rising in the Wind River Range, drains the greater part of southwestern Wyoming before joining the Colorado. The upper Bear River basin, part of the Interior Basin system, occupies a small section along the western border of the state.
Northwestern Wyoming is drained by the Snake River, a major tributary of the Columbia.The largest natural lake in Wyoming and probably the largest at its altitude (2,357 m/7,733 ft) anywhere in the United States is Yellowstone Lake, which covers an area of 339 sq km (131 sq mi) and has a maximum depth of 98 m (320 ft). Just to the south lies the second largest lake in Wyoming, Jackson Lake, with an area of about 100 sq km (about 40 sq mi). Jackson Lake has been enlarged by a dam on the Snake River. Fremont Lake, located north of Pinedale, is one of the state’s most spectacular lakes and was formed by glaciers that retreated as the climate warmed about 12,000 years ago. Some of Wyoming’s reservoirs are also of impressive size, especially the reservoir on the Green River created by Flaming Gorge Dam. "Wyoming" © Emmanuel BUCHOT, Encarta, Wikipedia.
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