Iowa Code § 355.14: Federal surveys — defacement.

If a person willfully defaces, injures, or removes a signal, monument, building, or other property of the United States national geodetic survey, or the United States geological survey, constructed or used under the federal law, the person is subject to a civil penalty not exceeding fifty dollars for each offense, and is liable for damages sustained by the United States in consequence of the defacing, injury, or removal, to be recovered in a civil action in any court of competent jurisdiction.