Mont. Code § 85-7-2134
If for any reason a levy of taxes or assessments under 85-7-2104 is not made for any irrigation district in any year by the board of commissioners of the district within the time provided by 85-7-2104, the board of county commissioners of the county in which the district is situated shall, not later than the second Monday in August, ascertain the total amount to be raised for all purposes of the district. The board of county commissioners shall make the levy pursuant to 85-7-2104 that should have been made by the board of commissioners of the district and shall furnish the county clerk with a list of the lands and the amount of taxes or assessments as provided in 85-7-2136. The levy has the same force and effect as though made by the board of commissioners of the district. This section applies only to irrigation districts having a bonded indebtedness and actually in possession of a dependable water supply system and furnishing substantial amounts of water to bona fide users.
§ 85-7-2134, MCA