Mo. Rev. Stat. § 61.290: Failure to perform duties — penalty (second, third and fourth class counties).

If any county highway engineer shall fail, refuse or neglect to visit and inspect, in person or by deputy, the roads, bridges and culverts in each road district in the county, at frequent and regular intervals, or shall fail, refuse or neglect to advise with, assist and direct the road overseers of his county in the performance of their duties, or if he shall fail, refuse or neglect to perform any of the duties imposed upon him by law, or if he be found incompetent or in any manner unfitted for such office, he may be removed from office by the county commission, and it shall be the duty of the county commission to remove such county highway engineer forthwith and to appoint a successor in his stead.