S.D. Codified Laws § 31-22-2
If the owner of such an isolated tract is unable to agree with the owner of surrounding lands for purchase of a right-of-way from such isolated tract of land to a public highway, he may apply to the board of county commissioners for relief, making his application in writing and describing the isolated tract and the surrounding land over which a right-of-way is desired. The county commissioners shall thereupon cause to be served upon the owner or owners of such surrounding land a notice in writing of a time when such board will visit such land and lay out one right-of-way across such surrounding land, and assess the damages therefor, which notice shall be served at least five days prior to the date set for such visit and appraisal.
SDCL 31-22-2