Its southern terminus is over 4 miles (6.4 km) east of the unincorporated village of South Bloomingville at State Route 56, and its northern terminus is near the unincorporated village of Rockbridge at US 33, west of Logan.

The road serves Hocking State Forest as well as Hocking Hills State Park, and the entire highway is part of the designated Hocking Hills Scenic Byway.

[5][6] A slight realignment occurred in the area of the Old Man's Caves within Hocking Hills State Park (along the section concurrent with SR 664) between 2011 and 2013.

[7] The realignment was needed to reduce the conflict between traffic on the road and pedestrians in the vicinity of the park.

The one-mile-long (1.6 km) realignment opened by January 2013.