SR 706 starts at an intersection with SR 7 in Elbe. After the junction, the road goes northeast, paralleling a railroad owned by Tacoma Rail. The railroad extends south to Morton and north to Tacoma. The highway then turns southeast to Park Junction. After passing Park Junction, SR 706 turns due east to National, where the railroad ends. From National, the road turns northeast and curves southeast into Ashford. In Ashford, the highway returns going due east before starting to curve and then end at the entrance to Mount Rainier National Park. The road continues east to the Henry M. Jackson Visitor Center.