The county highway engineer shall, on or before the first day of January in each year, file with the county commission a report, in writing, showing the general condition of the roads and bridges of the county, including all improvements, if any, made during the past year, together with his recommendations as to what improvements should be made during the coming year, and what part of same, if any, should be let under contract, as provided by law. At the same time said highway engineer shall file with the county commission a map or plat showing the township and road district lines, together with his recommendations as to the number, size and boundaries of road districts, and needed changes in same, and he shall give the county commission such further aid and assistance as it may require with reference to the laying out of road districts or changing the number or boundaries thereof.