36 CFR § 261.21
National Forest primitive areas
November 4, 2020
The following are prohibited in any area classified as a National Forest Primitive Area on September 3, 1964:
(a) Landing of aircraft or using a motor boat, unless such use had become well established before September 3, 1964.
(b) Possessing or using a motor or motorized equipment, except small battery powered, hand-held devices, such as cameras, shavers, flashlights, and Geiger-counters.
[42 FR 35959, July 13, 1977. Redesignated at 70 FR 68291, Nov. 9, 2005]