Minn. Stat. § 161.18: PRIOR EASEMENTS VEST IN STATE.

When any road or highway, including any city street or portion thereof, is taken over by the state as a trunk highway, the state as to any such road, street, or highway or portion thereof, without compensation paid therefor, shall be vested with all rights, titles, easements, and appurtenances thereto appertaining, held by or vested in any of the political subdivisions of the state prior to the time such road, street, or highway is taken over by the state.