Mo. Rev. Stat. § 257.210: Board and agents may enter lands for surveys — interference, penalty.

The board of trustees of a district, or their employees or agents, including contractors and their employees, may enter upon lands or premises within or without the district in order to make surveys and examinations to accomplish the necessary purposes of the district, or to have access to the work, being liable, however, for actual damage done, but no unnecessary damage shall be done. Any person preventing such entrance is guilty of misdemeanor, punishable by fine not exceeding fifty dollars.