Mo. Rev. Stat. § 245.520
The engineer appointed by the board of directors, under the provisions of sections 245.285 to 245.545, shall receive for his services a sum not to exceed seventy-five dollars per month for the time he is actually employed in field or other work, under contract with said board of directors. The salaries of all other officers, not otherwise fixed by the provisions of sections 245.285 to 245.545, and the agents and employees of said board of directors, shall be fixed by said board, and such salaries, and all other necessary expenses incurred by said board of directors in carrying into effect the provisions of sections 245.285 to 245.545, shall be paid out of the levee fund of the district, upon proper warrant issued by order of the board of directors.
§ 245.520, RSMo