The Department of Defense, specifically the U.S. Army Corps of Engineers, intends to negotiate a sole source modification contract with Massman Construction Co. for the emergency replacement of a downstream guide cell at Lock and Dam 25 in Winfield, Missouri. The contractor will be responsible for providing the necessary materials and labor to reconstruct a failed guide cell, which is critical for maintaining the operational integrity of the dam. This procurement is being conducted on a sole source basis due to unusual and compelling urgency, and no solicitation will be posted on Contracting Opportunities SAM.gov. Interested parties may contact Whitney Dee at whitney.r.dee@usace.army.mil or by phone at 314-331-8621 for further information.