Cheyenne, river, 527 mi (848 km) long, rising in E Wyo. and flowing NE to the Missouri River near Pierre, S.Dak. The Cheyenne basin is part of the Missouri River basin project. The U.S. Bureau of Reclamation has established a project on the Belle Fourche River, the Cheyenne's main tributary the Rapid Valley irrigation project in the Cheyenne valley and the Angostura Dam, for irrigation, hydroelectric power, and flood control, on the Cheyenne itself.

The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.

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