AR 170 begins at a three-way junction with AR 74 and AR 220 in Devil's Den State Park. The route runs north, winding through steep Ozarktopography. AR 170 serves as the southern terminus of AR 265 near the SEFOR reactor. The highway continues north through rural country, crossing over I-49. East of the expressway, AR 170 enters West Fork. The route enters town as Phillips St, turns south onto McKnight St, and turns left onto Main St.[5] AR 170 continues to US Route 71, where the route terminates.
^ abArkansas State Highway Commission (1936). Official Highway Service Map(TIF) (Map). Arkansas State Highway Commission. Retrieved December 5, 2016.
^ abArkansas State Highway Commission (1937). Official Highway Service Map(TIF) (Map). Arkansas State Highway Commission. Retrieved December 5, 2016.
^ abcdSystem Information and Research Division (2014). "Arkansas Road Log Database". Arkansas State Highway and Transportation Department. Archived from the original(MDB) on August 29, 2017. Retrieved March 27, 2016.
^Arkansas State Highway and Transportation Department (February 17, 2015). General Highway Map, Washington County, Arkansas(PDF) (Map). 1:62500. Arkansas State Highway and Transportation Department. Retrieved December 5, 2016.