The city agrees that if, for any reason, it is unable to maintain the previously described portion of the above named road to a standard satisfactory to the state highway department and Gallatin County, said Gallatin County is thereupon authorized to perform the necessary work to place the road, within the incorporated city limits, in a satisfactory condition by such means as may be at the disposal of said Gallatin County and that said Gallatin County will be reimbursed by the city for any expense it may incur in the performance thereof, on the basis of cost plus ten percent (10%). (1983 Code § 12.06.020)