Mont. Code Ann. § 70-17-102
The following land burdens or servitudes upon land may be granted and held though not attached to land:
History: En. Sec. 1251, Civ. C. 1895; re-en. Sec. 4508, Rev. C. 1907; re-en. Sec. 6750, R.C.M. 1921; Cal. Civ. C. Sec. 802; Based on Field Civ. C. Sec. 246; re-en. Sec. 6750, R.C.M. 1935; amd. Sec. 17, Ch. 489, L. 1975; R.C.M. 1947, 67-602.