The Department of Defense, specifically the Department of the Army through the W076 Endist Tulsa office, is soliciting proposals for the design and construction of a replacement guide wall extension cell at the W.D. Mayo Lock and Dam 14, part of the McClellan-Kerr Arkansas River Navigation System (MKARNS). This Design-Build Request for Proposal (RFP) is aimed at enhancing the infrastructure critical for navigation and water management in the region. The project falls under the NAICS code 237990, which pertains to Other Heavy and Civil Engineering Construction, and is set aside for small businesses in accordance with FAR 19.5 regulations. Interested contractors should reach out to Tyler Hastings at tyler.a.hastings@usace.army.mil for further details and to ensure compliance with submission requirements.