Mont. Code Ann. § 7-22-2144

The total cost of weed control within the district must be paid from the noxious weed fund. The cost of controlling weeds growing along the right-of-way of a state or federal highway must, upon the presentation by the board of a verified account of the expenses incurred, be paid from the state highway fund in compliance with 7-14-2132 and any agreement between the board and the department of transportation. Costs attributed to other lands within the district must be assessed to and collected from the responsible person as set forth in 7-22-2134.