Highway 58 turns left, ending the concurrency at the unincorporated community of Emery, with Highway 115 continuing east through rural areas and unincorporated communities Ben-Gay and Calamine to enter Lawrence County.

The two routes form an overlap northward, crossing the Strawberry River and entering the small town of Smithville.

The two routes turn eastward, passing the Smithville Public School Building, listed on the National Register of Historic Places.

[5] Highway 115 turns left in Smithville, ending the overlap and heading northward toward Imboden, passing a rural area populated with homes and small farms.

It continues northeast as a rural highway, passing the NRHP-listed Cedar Grove School No.

ARDOT estimates the traffic level for a segment of roadway for any average day of the year in these surveys.

[1] By September 1928, State Road 79 was rerouted between Imboden and Smithville along a more direct route, with the former alignment becoming Highway 117.