Every municipality or county court issuing bonds, or other evidences of indebtedness, under the provisions of this act, shall thereafter, so long as any such bonds or other evidences of indebtedness remain outstanding, operate and maintain its bridge so as to provide, charge, collect and account for revenues therefrom as will be sufficient to pay all operating costs, provide a depreciation fund, retire the bonds or other evidences of indebtedness, and pay the interest requirements as the same may become due. The ordinance or order pursuant to which any such bonds or other evidences of indebtedness are issued shall pledge the revenues derived from the bridge to the purposes aforesaid, and shall definitely fix and determine the amount of revenues which shall be necessary and set apart in a special fund for the bond requirements. The amounts, as and when so set apart into said special fund for the bond requirements, shall be remitted to the West Virginia Municipal Bond Commission at least thirty days previous to the time interest or principal payments become due, to be retained and paid out by said commission consistent with the provisions of this act and the ordinance or order pursuant to which such bonds or other evidences of indebtedness have been issued. Notwithstanding the foregoing, payments of principal and interest on any bonds owned by the United States or any governmental agency or department thereof may be made by the governing body directly thereto.