Site Navigation Arizona Colorado Idaho Montana Nevada New Mexico Utah Wyoming     Business Loop I-25 - Chugwater Index of Interstate 25 Wyoming Links Index and Guide Northbound - Laramie County Northbound - Platte County Northbound - Converse County Northbound - Natrona County Northbound - Johnson County Southbound - Johnson County Southbound - Natrona County Southbound - Converse County Southbound - Platte County Southbound - Laramie County Exit Guide Business Loop - Cheyenne Business Loop - Chugwater Business Loop - Wheatland Business Loop - Douglas Business Loop - Glenrock Business Loop - Casper Business Loop - Buffalo Interstate 25 Wyoming Business Loops - Junction Lists Routing In Chugwater, Business Loop I-25 follows Old U.S. 87 along First Street and TY Road via Wyoming 321. Mileage Table and Junction List Signed Route Milepost Number Description State Control Route Distance Overall Mileage Bus 0.00 Junction ; Begin SH 321 0.00 0.00 Page Updated October 3, 2005.