This is a sources sought notice for market research purposes to identify interested and capable firms to fabricate and deliver two complete sets of stoplogs (16 total) for the Soo Project Office in Sault Ste. Marie, Michigan. The stoplogs are large steel structures (approximately 115.7 feet long, with each complete set weighing about 751,200 pounds) requiring AISC certification as a Bridge or Hydraulic Fabricator with a Fracture Control Endorsement, plus welding per AWS D1.5-2025 with extensive non-destructive testing. Delivery will be by barge or ship to the Soo Locks in Sault Ste. Marie, Michigan, with the Government off-loading from barges. The anticipated period of performance is Winter 2027 through Fall 2029. The NAICS code is 332312 with a 500-employee size standard, and based on responses, the requirement may be set aside for small business.