Iowa Code § 556F.13: Compensation.

As a reward for the taking up of boats and other vessels, and for finding lost goods, money, bank notes, and other things, before restitution of the property or proceeds thereof shall be made, the finder shall be entitled to ten percent upon the value thereof, and for taking up any logs or lumber, as hereinbefore described, twenty-five cents for each log not exceeding ten, twenty cents for each exceeding ten and not exceeding fifty, fifteen cents for each exceeding fifty, and fifty cents per thousand feet for sawed lumber.