# SAM #140P2026R0109

Repair and Restoration of Historic Potomac River Dams 4 and 5 for National Park Service

**Buyer:** NPS DSC Contracting Services Division
**Posted:** September 15, 2026
**Respond By:** October 15, 2026
**Identifier:** 140P2026R0109
**NAICS:** 237990

This opportunity from the National Park Service (NPS), Denver Service Center, seeks qualified contractors for the repair and restoration of historic Potomac River Dams 4 and 5 in Maryland.
- Government Buyer:
  - U.S. Department of the Interior
  - National Park Service
  - Denver Service Center
- OEMs and Vendors:
  - Marine grade aluminum eel ladder specified as Milieu Inc., Lakeside Engineering, Inc., or equal
  - Eagle Creek Renewable Energy referenced for coordination on sluice gates
- Products and Construction Elements Requested:
  - Eel ladder (marine grade aluminum, substrate for juvenile eel, steel thimble supports, bulkhead, reinforced concrete features)
  - Eel ladder water supply system (submersible pumps, air compressor, piping; max 120 GPM attraction flow)
  - Concrete cap replacement (reinforced concrete, 4000 PSI minimum strength, stainless steel reinforcement/dowels)
  - Vertical rock anchors (150 ksi all-thread steel bars, ASTM A722/AASHTO M275, corrosion protection, minimum 10 ft bonded length)
  - Secant pile wall (2 ft diameter, vibratory/impact installation, concrete cap)
  - Toe drain pipe replacement (watertight joints, proper bedding/backfill)
  - Dry stack wall repair/rebuilding (stone replacement, repointing, chinking, armoring, topsoil seeding)
  - Spillway sluice gates replacement (2 stainless steel slide gates, 60" x 96", actuators, concrete restoration)
  - Instrumentation and monitoring equipment (automated piezometers, monitoring wells, staff gauges, electrical enclosures)
  - Erosion and sediment control measures (silt fences, stabilized entrances, revegetation with native species)
  - Masonry repointing and grouting (type N mortar, cementitious grout, pressure limits)
  - Tremie concrete placement (underwater void filling, temporary formwork)
  - Vegetation clearing and revegetation (native species, one-year maintenance)
  - Monument and signage installation (bronze survey monuments, dam safety signs per FEMA/USACE standards)
- Unique/Notable Requirements:
  - Strict adherence to environmental permits and historic preservation guidelines
  - Coordination with Maryland Department of the Environment, U.S. Fish and Wildlife Service, and other agencies
  - Phased construction with seasonal restrictions and environmental monitoring
  - Coordination with Eagle Creek Renewable Energy for sluice gate work
  - Detailed design and installation requirements for eel ladder and water supply system
  - One-year maintenance period for revegetation
  - Instrumentation for ongoing quality control and monitoring
  - Compliance with FEMA and USACE safety standards for signage
- No specific part numbers or purchase quantities for most items; technical details and requirements are provided in attachments.

### Description

The purpose of this Sources Sought Notice (SSN) is to gain knowledge regarding the types of interested businesses and their qualifications. Information obtained through this SSN by the National Park Service (NPS) will be utilized to develop the acquisition strategy. The amount of interest, or lack thereof, will determine the possibility of a Small Business or other Socio-Economic Set-Aside for solicitation and award purposes. Analysis of the quality of responses to this SSN will be considered in the Market Research being conducted and in the making of any set-aside determination for this requirement. See attached A14 SSN for more information.

[View original listing](https://sam.gov/opp/cf2b6037bf86422a9d28b2c14dc59f2f/view)