Mo. Rev. Stat. § 61.141
The highway administrator may charge such fees as may be agreed upon by him and the party requesting, or for whose benefit, such work is to be done, for doing, performing or furnishing any field or survey work as herein provided. No highway administrator or appointee of the highway administrator shall execute a survey ordered by any person, court, firm or corporation until the agreed price has been tendered in payment therefor. The highway administrator or his appointee shall not retain any fees, but all fees of whatever nature whatsoever collected by the highway administrator or his appointee shall be turned into the county treasury at least annually and before the end of the county fiscal year; except that if the registered and licensed surveyor appointed to perform the survey pursuant to the provisions of section 61.101 is not on the staff of the highway administrator and receiving a salary paid in regular installments by the county, he may retain the fee charged for performing the survey.
§ 61.141, RSMo