Length: 242 mi. Direction: south-north. South Dakota Highway 37 (SD-37) is a highway in the eastern part of South Dakota that begins near Niobrara at the Nebraska state line, and ends close to Hecla at the North Dakota state line. The road stretches across the counties of Bon Homme, Hutchinson, Davison, Sanborn, Beadle, Spink, and Brown. It was opened in 1926.
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