Mont. Code Ann. § 70-18-201

Alluvion or accretion – increase of bank

Where from natural causes land forms by imperceptible degrees upon the bank of a river or stream, navigable or not navigable, either by accumulation of material or by the recession of the stream, such land belongs to the owner of the bank, subject to any existing right-of-way over the bank.

History:
En. Sec. 1401, Civ. C. 1895
Re-en. Sec. 4573, Rev. C. 1907
Re-en. Sec. 6820, R.C.M. 1921
Cal. Civ. C. Sec. 1014
Field Civ. C. Sec. 443
Re-en. Sec. 6820, R.C.M. 1935
R.C.M. 1947, 67-1302.