The cost of the work was around £13,000, which was more than the original estimate, and there were insufficient funds to pay Pinkerton for his work. Interest was paid on the amount outstanding until the bill could be paid. The original plans for the canal section of the navigation included four locks, each of which was timber floored, and built to accommodate "Driffield-sized" Humber keels of . Keels could carry a maximum of 100 tons but were limited to a maximum of 70 tons in the Navigation due to draft limits. The initial locks were: