S.D. Codified Laws § 31-24-1
If the construction, improvement, and repair of any public highway by the state, or by any county or township, leaves a ditch or elevation along the roadside and deprives any abutting landowner of easy and convenient access from the owner's land to the highway, the highway authority, except as provided by chapters 31-7 and 31-8, shall provide the owner of the abutting tract or farm, as well as each church, school, park, playground, or other public building or ground, with one point of easy and convenient access to a public highway by constructing at the public expense, such grades, approaches, bridges, culverts, or other structures as may be necessary for that purpose. However, the provision authorizing construction of entrances at the expense of the authority having charge of the maintenance only applies to new construction.
SDCL 31-24-1