SDCL § 43-18-6: Resurvey and subdivision of lands--Law governing.

The resurvey and subdivision of lands by all surveyors shall be in all respects according to the laws of the United States and the instructions issued by the officers thereof in charge of the public land surveys; and in the subdivision of fractional sections, bounded on any side by a meandered lake or river, or the boundary of any reservation or irregular survey, the subdivision lines running toward and closing upon the same shall be run at courses in all points intermediate and equidistant, as near as may be, between like section lines established by the original survey.