When any bridge or canal shall be erected or constructed pursuant to consent of the county commissioners under § 140 of this article, the corporation shall report in writing to the county commissioners, under the oath or affirmation of the president or vice president; and the county commissioners shall appoint three persons to examine the same and report whether it has been erected or constructed in such a substantial and durable manner as is required to promote the public convenience, and the report shall be reviewed and ratified, or rejected by the county commissioners, who may appoint other persons to report thereon in their discretion.