South Dakota Highway 239

South Dakota Highway 239 (SD 239) is a 7.312 mi state highway located entirely within McPherson County, South Dakota. Its southern terminus is at an intersection with SD 10/SD 45. This terminus is located about 12 mi west-northwest of Leola and about 19.7 mi east-southeast of Eureka. Its northern terminus is at 106th Street in the small community of Long Lake.

Route description
SD 239 begins at an intersection with SD 10 / SD 45 south of Long Lake. Here, the roadway continues to the south as 350th Avenue. It travels to the north. Approximately 3 - 4 mi later, SD 239 curves slightly east to bypass a small lake. It then curves back to the west and straightens out to a due north course for the last 3 mi before it terminates at 106th Stree on the south side of Long Lake. SD 239 then becomes 350th Avenue after this terminus, which continues to the North Dakota state line.