SDCL § 31-3-19: County location proceedings--Highways to which applicable.

The provisions of §§ 31-3-23 to 31-3-37, inclusive, apply to all public highways by whatever authority located within any organized county that are not within the limits of any municipality. However, no portion of the state trunk highway system or county highway systems may be vacated, changed, or located except with the approval of and in accordance with an order made by the Department of Transportation.