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Greybull River
Native name Iisbíialawache, "Where the mountain lion sits"
Country United States
State Wyoming
Cities Meeteetse, WY, Greybull, WY
Physical characteristics
Main source Absaroka Mountains
Big Horn Basin, Wyoming
43°52′48″N 109°20′33″W / 43.88000°N 109.34250°W / 43.88000; -109.34250
River mouth Big Horn River
Greybull, Wyoming
44°28′15″N 108°02′59″W / 44.47083°N 108.04972°W / 44.47083; -108.04972
Length 90 mi (140 km)
Basin features
Tributaries
  • Right:
    Wood River

The Greybull River is a tributary of the Big Horn River, approximately 90 miles (140 km) long in northern Wyoming in the United States.

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.

GreybullRiver1963
Flooding of Greybull River near Basin, Wyoming in June 1963, where the peak flow was 19,400 cubic feet per second (550 m3/s).
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