The state highway's western terminus is at a T-intersection with SR 309 nearly 3 miles (4.8 km) southeast of Ada.

The highway runs northeast a short distance before turning due east onto the boundary between Marion and Liberty Townships.

The highway crosses a CSX railway line, after which it meets TR 145 prior to arriving at its endpoint at US 68.

The AADT identifies the amount of traffic using a particular stretch of highway on any average day of the year.

The NHS is a network of routes that are determined to be most important for the economy, mobility and defense of the nation.