This document summarizes a federal contract solicitation for subsurface investigation and upstream approach wall construction work at the Soo Lock Complex in Sault Ste. Marie, Michigan. The Detroit District of the US Army Corps of Engineers is seeking a firm fixed price construction contract to perform scope of work details that will be provided in the solicitation documentation. Interested offerors should monitor beta.SAM.gov for solicitation details including any amendments, responses to questions, and submission instructions. The work is intended to start within 30 days of contract award. The NAICS code is 237990 for other heavy and civil engineering construction, and the size standard is $39.5 million. There is no set-aside designated. The primary point of contact for inquiries is the contract specialist via the provided email and phone number.