AMP: 41 Location: Main Ave and 1st St, Choteau At the Teton County Courthouse, we’ll approach US-287 AMP: 41 Location: Main Ave and Division St, Choteau At the courthouse, turn right for US 287 and keep right for US 89. This is the northern terminus of US 287, a long 3dus that heads all the … Continue reading U.S. Route 89, S-221 to US-287