The County Highway Superintendent, subject to the approval of the Board of County Commissioners, is in charge of constructing, maintaining and repairing all of South Dakota's 24,000 miles of county roads and 3,500 bridges. Highway Superintendents, in many cases, also maintain the township roads in their county. In each county, the Highway Superintendent is charged with the direction and supervision of work and keeps record of costs. The Highway Superintendent must approve all bills associated with county road maintenance before payment. Payment for work on county road systems is made from the county road and bridge fund.