ARM 12.11.619
ARM 12.11.619. BOULDER RIVER
Cite as Mont. Admin. R. 12.11.619
(1) The Boulder River and its tributaries are closed to all motorized watercraft, as defined in 23-2-502, MCA, except:
(a) motorized watercraft 10 horsepower or less are permitted from the Natural Bridge Falls to the Yellowstone River from April 1 to September 30.