Minn. Stat. § 160.04: WIDTH OF ROADS.

Except as otherwise provided, all roads hereafter established, except cartways, shall be at least four rods wide. Additional right-of-way and easements, including easements needed for drainage, may be acquired by purchase, gift, or eminent domain proceedings when necessary for construction, maintenance, safety, or convenient public travel. The necessity for such additional right-of-way and easements shall be determined by the road authority having jurisdiction over the particular road involved.