The Department of Defense, specifically the U.S. Army Corps of Engineers, Los Angeles District, is seeking to modify an existing contract with Tetra Tech, Inc. to increase the capacity for the Rio De Flag Flood Control Project in Coconino County, Arizona. This modification aims to enhance the IDIQ contract by $621,944.64 to complete the Final Design Material for the Mainstem Channel Improvements, incorporating previous work and addressing unanticipated design coordination efforts. The project is critical for flood risk reduction and is linked to interconnected city projects, with the total modification valued at $750,000. Interested parties can contact Otse A. Adikhai at Otse.A.Adikhai@usace.army.mil or by phone at 213-452-3248 for further details.