The document outlines the U.S. Army Corps of Engineers' Navigation Ecosystem Sustainability Project (NESP) for Lock and Dam No. 25, specifically focusing on lock foundation and site preparation. This project, a collaborative effort by multiple USACE districts, involves extensive civil, structural, geotechnical, and hydrographic surveys. Key aspects include detailed plans for demolition, site preparation, foundation work, riprap excavation, and the construction of a sheet pile separator wall. The project is located in Winfield, MO, on the Upper Mississippi River. The document provides general information, an index of drawings, and general abbreviations to guide contractors through the complex plan sets, emphasizing adherence to specific survey datums and environmental restrictions. Contractor access, staging areas, and operational guidelines for the lock during construction are also detailed, ensuring safety and compliance.

This government file details the U.S. Army Corps of Engineers' Navigation Ecosystem Sustainability Project (NESP) for Lock and Dam No. 25 on the Upper Mississippi River, specifically for Lock Foundation and Site Preparation. The document includes various technical drawings and data, such as hydrographs (2013-2023), elevation duration and frequency curves (1952-2022), and elevation-flow curves, all critical for understanding the river's hydraulic conditions. It also provides an extensive Soil and Rock Legend, unified soil classification (ASTM D 2487), consistency for cohesive soils, drilling and sampling equipment, and applicable publications for engineering and testing standards. Additionally, the file contains overall and detailed boring location plans with general notes, indicating historical and new exploration borings, and a conversion factor for historical boring elevations from NGVD 29 to NAVD 88. The solicitation number for this project is W912P9-26-R-A001, with an issue date of August 2025.

This government file outlines the

The document outlines the riprap excavation and foundation preparation for the Upper Mississippi River Navigation Ecosystem Sustainability Project (NESP) at Lock and Dam No. 25. It details cross-sections for riprap excavation, including phases 1 and 2, and the placement of various riprap types (derrick stone, 1000 LB, 5000 LB, 2200 LB, and C-stone) and stone protection on lumber mattresses. The project involves removing existing timber mattresses and alluvium, with careful consideration for existing structures like the dam end sill, timber cribs, and concrete aprons. Foundation preparation includes establishing excavation grades, sand fill grades, and installing separator walls, pipe piles, and articulating fabric-formed concrete mattresses. The project, managed by the U.S. Army Corps of Engineers, St. Louis District, is crucial for the lock foundation and site preparation, with an issue date of August 2025.

The document outlines the Upper Mississippi River Navigation Ecosystem Sustainability Project (NESP) at Lock and Dam No. 25, focusing on lock foundation and site preparation. It details site preparation, including typical sections for fill and existing ground conditions, and specifies the abandonment of existing pipe outfalls and the installation of new sanitary lines with riprap slope protection. The project also includes extensive dredging plans, identifying dredge and fill/disposal areas, alluvium removal, and contractor work limits within Missouri. Key dredging depths are specified, ranging from 395.0 NAVD88 to 414.0 NAVD88, with a required depth of 396.6 NAVD88 for certain areas and alluvium removal to 404.60 NAVD88. Additionally, the file details the design and construction of sheet pile separator and deflector walls, providing plans, elevations, sections, and detailed views of components like pipe piles, stiffener plates, and neoprene pads. These elements are critical for navigation channel safety and structural integrity.

The document, consisting solely of repeated instances of "REFERENCE DRAWINGS," indicates that a set of reference drawings is integral to the associated government solicitation, grant, or RFP. While the content is minimal, its repetition implies that these drawings are crucial for understanding the project's scope, requirements, or specifications. In the context of government procurement, reference drawings typically provide essential visual information, such as architectural plans, engineering schematics, or site maps, necessary for bidders or grantees to accurately prepare their proposals. The document's purpose is to emphatically highlight the existence and importance of these supplementary visual aids, which are fundamental for any interested party to fully comprehend and respond to the primary solicitation.

The document, titled "DOWNSTREAM GUIDE WALL SILT REMOVAL," details a project for silt removal at the Mississippi River Lock & Dam No. 25 in Lincoln County, Illinois. This project falls under the purview of the St. Louis District of the U.S. Army Corps of Engineers. The file includes reference drawings, a cover sheet, and a vicinity map, providing geographical context for the project location within the St. Louis District's area of responsibility, which spans parts of Illinois, Missouri, Iowa, and Kentucky. Key personnel involved in the design are identified, including J. Leff, M. Hartman, and D. Reilly. The document is likely a component of a federal government RFP, outlining the scope and location for contractors or grantees. It emphasizes the specific task of removing silt from the downstream guide wall at the designated lock and dam, critical for maintaining navigation and operational efficiency on the Mississippi River.

The document outlines the U.S. Army Corps of Engineers' plan for the Downstream Guide Wall Silt Removal project at Mississippi River Lock & Dam No. 25 in Lincoln County, Illinois. This project involves detailed civil site plans, excavation cross-sections, spoil area cross-sections, and civil details. Key aspects include the construction of a new permanent haul road, the management of a spoil laydown area with specific elevation and sloping requirements, and the excavation of silt near the downstream guide wall. The plan specifies strict safety protocols, such as maintaining a 10-foot distance from the guide wall for construction equipment and coordinating with Missouri One Call for utility verification. The document also includes extensive appendices detailing instrumentation inventory, locations, and thresholds for inclinometers, joint bolts, and piezometers, crucial for monitoring structural stability during the project.

The US Army Corps of Engineers, St. Louis District, is soliciting bids for the Upper Mississippi River Navigation Ecosystem Sustainability Project (NESP) at Lock and Dam No. 25, focusing on lock foundation and site preparation. The solicitation, W912P9-26-R-A001, details comprehensive specifications including special contract requirements, environmental protection, quality control, earthwork, and marine construction. The pricing schedule covers mobilization, erosion control, pile installation, excavation, scour protection, and demolition, with specific guidelines for unit and total pricing, and evaluation of subdivided items. The project emphasizes adherence to safety regulations, environmental compliance, coordination with ongoing operations, and strict protocols for river work, diving, and gate operations. Contractors must manage their work areas, utilities, and maintain access while providing required insurance and electronic payroll submissions.

The U.S. Army Corps of Engineers (USACE), St. Louis District, issued a Sources Sought Notice (W912P926RA001) for the Lock Foundation and Site Preparation project at Lock & Dam 25. This notice is for informational and planning purposes only, seeking industry input on Project Labor Agreements (PLAs) and releasing draft Plans & Specifications to aid in preparing future solicitation documents. The project involves constructing a lock foundation, site preparation, excavation, dredging, and placement of sand fill and riprap, along with a sheet pile separator wall and a downstream deflector. The anticipated Firm-Fixed-Price Construction contract is estimated between $25,000,000 and $50,000,000, with a 365-day performance period. The relevant NAICS code is 237990 (Other Heavy and Civil Engineering Construction – Exception Dredging Activities), with a size standard of $37,000,000. USACE is soliciting responses from prime contractors by October 6, 2025, regarding business capabilities, bonding capacity, experiences with PLAs, skilled labor availability, scheduling concerns, and opinions on how PLAs would impact project economy and efficiency.