S.D. Codified Laws § 31-13-16
Whenever the owners of eighty percent of the property fronting upon any road in a road district established pursuant to § 31-13-15 shall by petition in writing filed with the township clerk request that the property in the road district be assessed for road improvement, the supervisors shall set a time for hearing the petition and notice shall be given to the abutting property owners whose property it is proposed to assess who shall not have joined in the petition, by either delivery to the property owners of a copy of the notice of hearing or by mailing a copy of notice of hearing to such abutting property owner at his last known post office address, or if such address cannot be determined, then by publishing such notice in a legal newspaper designated by the supervisors as most likely to give notice, which notice shall be given at least ten days prior to the hearing.
SDCL 31-13-16