SDCL § 31-3-4: Location on boundary line--Half of highway taken from each side.

When a public highway is laid out and located upon a line dividing the land of two individuals, but not on the section line, one-half of the same must be taken, if practicable, from the land of each, provided whenever the taking of more land from one individual than the other will result in better alignment, less costly construction, or will save valuable trees or buildings from destruction, the highway may be laid out and the right-of-way taken unequally from said owners.