SDCL § 31-12-12: Small projects--Advertising, private contract, or county work permitted.

Any road, tile, or culvert construction, repair work, or materials upon the county highway system, for which the county highway superintendent's estimated cost equals or is less than the amount provided for in § 5-18A-14, may be advertised and let at a public letting by the board of county commissioners, may be let privately at a cost not to exceed the county highway superintendent's estimate, or may be built by day labor.