Any county having a population of not less than 140,000 nor more than 200,000, in which any board of county commissioners, have constructed or reconstructed any bridge or bridges through order of the board of directors of any drainage district organized under the laws of this state; and any such bridge or bridges are now in need of repairs; the board of county commissioners of said county wherein such bridge or bridges are located, is hereby authorized and instructed to repair the same in the same manner as other bridges in said county and for the purpose of paying for such improvements may issue bonds of such county without the same being authorized by any election and subject only to the limitations contained in this act. The amount of bonds so authorized to be issued shall not exceed the actual cost of such improvements: Provided, however, That the total amount of bonds issued under this act shall not exceed the sum of one hundred twenty-five thousand dollars ($125,000) in any one year.