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River, northern Wyoming and southeastern Montana, U.S. It rises in the foothills of the Bighorn Mountains in Wyoming and flows north 486 mi (782 km) to join the Yellowstone River near Terry, Mont. Tributaries include the Little Powder River and Crazy Woman Creek.
This entry comes from Encyclopædia Britannica Concise. For the full entry on Powder River, visit Britannica.com.
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