Lamar River, River in Yellowstone National Park, United States.
The Lamar River is a waterway flowing through the northeastern section of Yellowstone National Park for about 40 miles before meeting the Yellowstone River near Tower Junction. The river runs through a wide valley with open meadows and forested slopes that support large wildlife populations.
The river was named in 1884 after Lucius Quinctius Cincinnatus Lamar, who served as Secretary of the Interior during an early geological survey of the region. This naming reflects the park's early exploration and mapping period in the late 1800s.
The valley serves as a natural passage for large herds of bison that follow their own routes through the landscape. Visitors can watch these animals move freely and see how central this river is to the park's wildlife.
The river valley is reachable via the Northeast Entrance Road, where several pullouts offer good spots for watching animals and for fishing. The best time to visit depends on what you want to see, as wildlife activity changes with the seasons.
Three locations along the river—Soda Butte, Crystal Creek, and Rose Creek—played a key role in the wolf reintroduction program that began in 1995. Today these sites attract visitors interested in this important chapter of the park's conservation efforts.
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