LOCK FOUNDATION AND SITE PREPARATION FOR LOCK and DAM 25 NAVIGATION ECOSYSTEM SUSTAINABILITY PROGRAM (NESP)

Quick Summary

The U.S. Army Corps of Engineers, St. Louis District, is soliciting proposals for Lock Foundation and Site Preparation for the Lock and Dam 25 Navigation Ecosystem Sustainability Program (NESP) in Winfield, MO. This is a Firm Fixed-Price Construction contract with an estimated magnitude between $25,000,000 and $50,000,000. Proposals are due by April 24, 2026, at 3:00 PM CST.

Scope of Work

This project involves comprehensive lock foundation and site preparation. The lock foundation work includes excavation and disposal of existing scour protection riprap, dredging and placement of sand fill for the proposed lock foundation, and placement of a riprap berm. It also requires the construction of a sheet pile separator wall, braced with piles, to separate the river side riprap berm from the dredged sand, and a deflector on the downstream side of the dam to route water. Site preparation includes placing additional dredge borrow upland for a future staging and laydown area and installing a sanitary outfall pipe. Detailed engineering drawings, specifications, and hydrographic data are provided in the plan sets.

Contract Details

• Contract Type: Firm Fixed-Price Construction
• Estimated Value: Between $25,000,000 and $50,000,000
• Period of Performance: 365 calendar days for Site Preparation, 548 calendar days for Lock Foundation, both from Notice to Proceed.
• NAICS Code: 237990 (Other Heavy and Civil Engineering Construction - Dredging Activities)
• Size Standard: $45,000,000 (for NAICS 237990)
• Set-Aside: Full and Open Competition
• Place of Performance: Winfield, MO 63389, United States

Key Requirements & Deliverables

The project requires furnishing all equipment, labor, supervision, quality control, supplies, materials, and incidentals. Technical specifications cover environmental protection, earthwork, structural steel, steel pipe piles, temporary facilities, instrumentation, and dredging. A Project Labor Agreement (PLA) is mandatory and must be submitted with the proposal; failure to do so will render the offer ineligible for award. A bid/offer guarantee is also required.

Submission & Evaluation

Proposals must be submitted electronically via the Procurement Integrated Enterprise Environment (PIEE) Solicitation Module by April 24, 2026, at 3:00 PM CST. Evaluation will be based on a Subjective Best Value Trade-Off, considering four factors:

1. Construction Approach: (Site Layout, Underwater Excavation, Separator Wall Installation, Schedule)
2. Past Performance: (Recency, relevancy, quality within 15 years)
3. Small Business Participation: (Commitment to 25% target)
4. Price: (Reasonableness and realism) Factors 1 and 2 are equally important and more important than Factor 3. Factors 1, 2, and 3 combined are equally important as Factor 4. A "Marginal" rating or better is required for all non-cost factors. Inquiries were re-opened via ProjNet until April 3, 2026.

Amendments & Notes

Recent amendments include:

• Amendment 0006: Incorporates tax exemption language for materials physically incorporated into the project.
• Amendment 0005: Replaces FAR clause 52.236-16 with Alternate 1 and updates drawing sheets G1002 and CG203.
• Amendment 0004: Updated pricing schedule (adding "Separator Wall Backfill"), revised specifications, and updated drawings based on bidder inquiries.
• Amendment 0003: Revised pricing schedule, updated numerous technical provisions, and re-opened bidder inquiries.
• Amendment 0002: Corrected the small business size standard to $45M, confirmed bid guarantee requirement, and clarified PIEE submission.