At the time of finally establishing the district, the boards of the several counties, acting jointly, shall employ a competent engineer to have charge and supervision of the construction of the improvement and they shall fix the engineer's compensation and the engineer shall, before entering upon said work, give a bond running to the several counties for the use and benefit of the district in the same amounts and of like tenor and effect as is provided in districts wholly within one county. A duplicate of such bond shall be filed with the auditor of each of said counties.
Iowa Code § 468.287
Bond, §468.33