Whenever an emergency arises requiring immediate expenditure for the repair or rebuilding of bridges and approaches to bridges, when such bridges and approaches to bridges are required to be built immediately, and on such short time that in the judgment of the board of county commissioners the public would be seriously inconvenienced in awaiting the regular advertising for bids for such building and rebuilding of bridges and approaches, the board of county commissioners may enter into contract for any such building or rebuilding of bridges and approaches to bridges without advertising for the letting of any contract therefor.
SDCL 31-14-24