# LOCK FOUNDATION AND SITE PREPARATION FOR LOCK and DAM 25 NAVIGATION ECOSYSTEM SUSTAINABILITY PROGRAM (NESP) Canonical: https://abierto.us/opportunities/w912p926ra001 - Solicitation number: W912P926RA001 - Notice type: Solicitation (first published as sources sought) - Status: Closed. Deadline was April 24, 2026 at 11:00 AM EDT - Department: Department of the Army - Agency: Department of the Army - Contracting office: W07V Endist ST Louis (W912P9) - NAICS: 237990 Other Heavy and Civil Engineering Construction - Product or service code: Y1PZ Construction Of Other Non-Building Facilities - Place of performance: Winfield, Missouri - County: Lincoln County (FIPS 29113). https://abierto.us/counties/lincoln-county-mo-29113 - City: Winfield. https://abierto.us/cities/winfield-mo-2980422 - First posted: February 26, 2025 - Last posted: April 23, 2026 - SAM.gov: https://sam.gov/workspace/contract/opp/d02f3cee343848308827514798f3e1e4/view ## Description Amendment 0006 The purpose of this amendment is to incorporate tax exemption language. All other terms and changes remain unchanged. Amendment 0005 The purpose of this amendment is to remove FAR clause 52.236-16 and replace it with FAR 52.236-16 Alternate 1. This amendment also incorporates updated drawing sheets GI002 and CG203. All other terms and conditions remain unchanged. Amendment 0004 This amendment is issued to provide replies to ProjNet Bidder Inquiries as of 8 Aprio, and make all resulting changes. See attachments for full details of Amendment 0004. Amendment 0003 This amendment is issued to provide replies to ProjNet Bidder Inquiries, and make all resulting changes. ProjNet Bidder Inquiries is re-opened through 4:00pm CST, 3 April 2026. There are some attachments that must be requested in order to be provided via DoD SAFE. See attachments for full details of amendment 0003. Amendment 0002 This amendment is hereby issued to make administrative updates to the above-referenced solicitation in accordance with the Government Responses to ProjNet Bidder Inquiries as of 4 March 2026: Amendment 0001 This amendment is issued to make administrative updates to the solicitation. Proposal will be submitted via EMAIL Angie Grimes at angie.l.grimes@usace.army.mil and Whitney Dee at whitney.r.dee@usace.army.mil The U. S. Army Corps of Engineers, St. Louis District, is seeking a firm to furnishing all equipment, labor, operators, supervision/site superintendent, quality control, supplies, materials, and incidentals necessary to satisfactorily perform and provide construction activities of lock foundation and site preparation work. The lock foundation work establishes the lock wall and floor foundation. It consists of excavation and disposal of existing scour protection riprap that was part of previous scour hole emergency repair, dredging of sand fill, placement of sand fill in the proposed lock foundation, and placement of riprap berm. Work also includes the construction of a separator wall that will separate the river side riprap berm from the dredged sand that will be placed as foundation material for the future river wall monoliths and lock floor. The separate wall will be a sheet pile wall braced with piles. This effort also includes a deflector on the downstream side of the dam to route water flowing through the tainter gated dam adjacent to the river walls around the sheet pile separator wall. For the site preparation work, additional dredge borrow will be placed upland for a future staging and laydown area and a sanitary outfall pipe will be installed. ## Publications - February 26, 2025: Sources sought, due March 28, 2025 at 12:00 PM EDT. Notice db19361abd4d436e8110186e8182606b. https://sam.gov/workspace/contract/opp/db19361abd4d436e8110186e8182606b/view - March 5, 2025: Sources sought, due March 28, 2025 at 12:00 PM EDT. Notice 28f75f404d1045da8bbbbaa0331e1221. https://sam.gov/workspace/contract/opp/28f75f404d1045da8bbbbaa0331e1221/view - September 5, 2025: Sources sought, due October 6, 2025 at 11:00 AM EDT. Notice c3f44357f025491c9c30da8aed79be28. https://sam.gov/workspace/contract/opp/c3f44357f025491c9c30da8aed79be28/view - January 15, 2026: Presolicitation, due March 31, 2026 at 12:00 PM EDT. Notice 94e7c6a9687b495a8eaf240a54433841. https://sam.gov/workspace/contract/opp/94e7c6a9687b495a8eaf240a54433841/view - January 22, 2026: Presolicitation, due March 31, 2026 at 12:00 PM EDT. Notice d8f9ee6183e142fcad8c573866edd764. https://sam.gov/workspace/contract/opp/d8f9ee6183e142fcad8c573866edd764/view - February 23, 2026: Solicitation, due April 24, 2026 at 11:00 AM EDT. Notice 4f116fe05d7c4dbcbb6c8e58b87ca969. https://sam.gov/workspace/contract/opp/4f116fe05d7c4dbcbb6c8e58b87ca969/view - February 23, 2026: Presolicitation, due February 22, 2026 at 11:00 AM EST. Notice e842b1709c734645b352589ec7a2b3b9. https://sam.gov/workspace/contract/opp/e842b1709c734645b352589ec7a2b3b9/view - February 24, 2026: Solicitation, due April 24, 2026 at 11:00 AM EDT. Notice 7df03dd7881642839fcdd470f9040bff. https://sam.gov/workspace/contract/opp/7df03dd7881642839fcdd470f9040bff/view - March 4, 2026: Solicitation, due April 24, 2026 at 11:00 AM EDT. Notice c0ef9b679c43432cb63bd4419282756d. https://sam.gov/workspace/contract/opp/c0ef9b679c43432cb63bd4419282756d/view - March 27, 2026: Solicitation, due April 24, 2026 at 11:00 AM EDT. Notice b190f3c683574fc0b92122df29dc9c1a. https://sam.gov/workspace/contract/opp/b190f3c683574fc0b92122df29dc9c1a/view - April 10, 2026: Solicitation, due April 24, 2026 at 11:00 AM EDT. Notice de33e4e338d64c77ad977daa8dd42b37. https://sam.gov/workspace/contract/opp/de33e4e338d64c77ad977daa8dd42b37/view - April 14, 2026: Presolicitation, due April 24, 2026 at 12:00 PM EDT. Notice 02bca843ba80409f8ca918df84ca89b6. https://sam.gov/workspace/contract/opp/02bca843ba80409f8ca918df84ca89b6/view - April 16, 2026: Solicitation, due April 24, 2026 at 11:00 AM EDT. Notice c386e95c93f2454c8af96860e251219a. https://sam.gov/workspace/contract/opp/c386e95c93f2454c8af96860e251219a/view - April 23, 2026: Solicitation, due April 24, 2026 at 11:00 AM EDT. Notice d02f3cee343848308827514798f3e1e4. https://sam.gov/workspace/contract/opp/d02f3cee343848308827514798f3e1e4/view ## Points of contact - Angie Grimes, angie.l.grimes@usace.army.mil, 314-331-8965 - Whitney Dee, whitney.r.dee@usace.army.mil, 314-332-8621 --- Source: SAM.gov Contract Opportunities bulk extract. Confirm deadlines on SAM.gov before responding. Cite https://abierto.us/opportunities/w912p926ra001.