Mont. Code Ann. § 76-15-411

As a condition to the extending of any benefits under this chapter to or the performance of work upon any lands not owned or controlled by this state or any of its agencies, the supervisors may require contributions in money, services, materials, or otherwise to any operations conferring such benefits and may require land occupiers to enter into and perform such agreements or covenants as to the permanent use of such lands as will tend to prevent or control erosion and prevent floodwater and sediment damages thereon.