United States, March 30 -- FlatironDragados and joint venture partner Aecon have finalized a $691 million contract with the U.S. Army Corps of Engineers, Seattle District, to deliver the Howard A. Hanson Dam Additional Water Storage Fish Passage Facility in Ravensdale, Washington.Employing the Integrated Design and Construction method developed by USACE, this collaborative approach brings together the designer of record and contractors from the early design phase through construction. The model improves coordination, helps mitigate risk and enhances cost and schedule certainty - supporting early alignment among project stakeholders and more informed decision-making throughout the project. Following successful completion of the collaborative...