No part of the Panama Canal draws more attention than its massive locks. If lock size continues as a primary attraction at canal sites, the twin locks being built for the Ohio River navigational system at Smithland, Kentucky should soon prove to be a new tourist attraction. There are, of course, some aspects of the building to the Panama and the Smithland structures that defy comparison: terrain, climatic conditions and access to materials. On the other hand, up to 40,000 men worked ten years to create the Panama Canal and literally thousands of hours were spent on forming needs, while just 650 men will complete the Ohio River canal in four years. Instead of thousands of hours being spent on forming needs, modern reusable steel forms are being set in position quickly and efficiently for casting 900,000 cubic yards of concrete. Approximately 1.7 miles of walls ranging up to 64 feet in thickness and 128 feet in height will be built in 20 months. The steel frames used on the Smith land projects are equipped with wood facings. The two inch tongue and groove yellow pine facing is preferred because of the ease of attaching wood recess forms and because wood is easier to cut and patch when necessary. Previous experience with the use of cantilevered forms on a number of mass concrete projects has shone them to be the most economical type. Since the internal ties required by other types of forms are replaced by anchors, erection of the cantilevered forms requires few man hours per square foot of surface. New forms are being used for this project because member sometimes present in used panels. These and other factors assure greater uniformity, simplify the work and produce better finished concrete.