The U.S. Army Corps of Engineers is seeking input for the construction of the New Lock at the Soo Remaining Upper Approach Walls (RUAW), a heavy civil marine project in a constrained environment at the Soo Locks. The work involves installing steel sheetpile and combination walls, demolishing historic structures, and adding concrete caps, mooring bollards, and electrical lines across three distinct work areas. The estimated construction magnitude is between $25 million and $100 million, with performance located on an island requiring waterborne transport of materials and equipment. Responses to this market research questionnaire are due by June 15, 2026, and the government is gathering feedback on logistics, phasing, and constructability to inform the acquisition strategy. This notice is for planning only and does not constitute a solicitation or commitment to contract.