43 U.S. Code § 362 - Injury to signposts and filling up or fouling water supply
Whoever shall willfully or maliciously injure, destroy, deface, or remove any of said monuments or signposts, or shall willfully or maliciously fill up, render foul, or in anywise destroy or impair the utility of said springs, streams, or water holes, or shall willfully or maliciously interfere with said monuments, signposts, streams, springs, or water holes, or the purposes for which they are maintained and used, shall be fined not more than $1,000 or imprisoned not more than three years, or both.
Source(Aug. 21, 1916, ch. 360, § 3,39 Stat. 518.)