|Native name||Iisbíialawache, "Where the mountain lion sits"|
|Cities||Meeteetse, WY, Greybull, WY|
|• location||Big Horn Basin, Wyoming|
|Mouth||Big Horn River|
|Length||90 mi (140 km)|
|• right||Wood River|
The river was reportedly named for a white buffalo that had been seen on its banks. Native Americans consider the appearance of a white buffalo a powerful omen.
The river rises near Francs Peak in the Absaroka Mountains in the southwest corner of the Big Horn Basin. It joins with the Wood River and leaves the mountains near the town of Meeteetse, continuing through the southern parts of Park County and Big Horn County before flowing into the Big Horn River near Greybull. Much of the upper river is considered a top trout stream, hosting the best genetically pure populations of Yellowstone cutthroat trout in the region. In 1981, a colony of black-footed ferrets was discovered on the Pitchfork Ranch near Meeteetse. The animal had previously been thought to be extinct.
- "Little Big Horn College Library". Retrieved 2012-06-05.
- U.S. Geological Survey Geographic Names Information System: Greybull River, USGS GNIS
- Greybull River Basin Archived 2008-12-01 at the Wayback Machine, Nature Conservancy
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