S.D. Codified Laws § 43-21-5
Each plat of real property acquired by the forest service of the United States Department of Agriculture, the State Department of Transportation, the South Dakota Building Authority, and the several counties and municipalities of the State of South Dakota and, which plat is subscribed to by the forest engineer of the forest service of the United States Department of Agriculture, an authorized agent of the State Department of Transportation, or any registered land surveyor in the employ of the forest service of the United States Department of Agriculture, the State Department of Transportation, the South Dakota Building Authority, or the several counties or municipalities of the State of South Dakota, shall be entitled to record in the office of the register of deeds, in which such lands or any portion thereof are situated without compliance with the provisions of chapter 11-3 or this chapter, pertaining to the filing of plats for record. Any amendments or vacations of plats filed by the forest service of the United States Department of Agriculture, the State Department of Transportation, the South Dakota Building Authority, or several counties or municipalities of the State of South Dakota may be entitled to record in like manner. All plats filed by the counties subsequent to January 1, 1968 shall be valid and covered by the provisions of this section. No plats filed for record under this section may operate of themselves to transfer title to the property described but such plats are for descriptive purposes only.
SDCL 43-21-5