The highway begins at Point Brown Avenue in Ocean Shores and travels east across the peninsula before turning north and ending at SR 109 south of Ocean City at Oyehut-Hogan's Corner.

SR 115 was established in 1973 to serve Ocean Shores and follows a road built in the 1950s.

SR 115 begins as Damon Road at an intersection with Point Brown Avenue north of Ocean Shores in Grays Harbor County, located on the shores of the Pacific Ocean.

[3] SR 115 continues north into woodlands, passing several unnamed lakes, to Oyehut-Hogan's Corner, where the highway ends at an intersection with SR 109 west of Hogan's Corner Airport.

[2][6][7] The highway was added to the state system on the recommendation of the state legislature's transportation committee, noting that it served as a major recreational route for travelers outside the local area.