USACE - Rock Island - This project involves the fabrication and delivery of new bolted Tainter gates for Lock and Dam 21. The work includes the off-site fabrication of tainter gates, measuring approxi... USACE - Rock Island - This project involves the fabrication and delivery of new bolted Tainter gates for Lock and Dam 21. The work includes the off-site fabrication of tainter gates, measuring approximately 20 feet high by 64 feet long, which are comprised of cold-rolled shapes and welded assemblies. These welded assemblies must comply with AWS D1.1 standards and are designed without fracture-critical members to enhance structural reliability.