Continuing south, I-90/US 87 parallels S-451 and the Little Bighorn River, passing by Garryowen, Benteen, Lodge Grass and Wyola before exiting the state of Montana and entering Sheridan County, Wyoming.
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An older son, Peter K. Simpson, is a retired historian and administrator at the University of Wyoming who served in the state House from 1981 to 1984 from Sheridan County, where he was then residing while serving as an administrator at Sheridan College.
The EBF Bridge over Powder River is a bridge located near Leiter, Wyoming, which carries Sheridan County Road CN3-269 over the Powder River.