When the estimated cost of opening, establishing, constructing, changing, abandoning, discontinuing, or widening a county road exceeds $1,000, the work may in the discretion of the board be let by contract unless the board shall find that such work may be otherwise done at less cost.
Contracts For County Roads
Mont. Code Ann. § 7-14-2402, under County Road and Bridge Contracts.
Mont. Code Ann. § 7-14-2402