Y--Conconully Dam, WA, Safety of Dams Modification

The Department of the Interior’s Bureau of Reclamation has issued an invitation for an Industry Day on October 21, 2026, in Conconully, Washington, for the upcoming Conconully Dam Safety of Dams (SOD) Modification Project. The event aims to introduce qualified contractors to the project's technical specifications, construction constraints, and procurement processes, while facilitating early industry feedback. Major project elements include deep soil mixing of downstream foundation soils to a depth of 70 feet, constructing a 500,000-cubic-yard downstream stability berm, lining the existing rock tunnel outlet works with an encased 60-inch steel pipe, extending the outlet works by 300 feet with downstream valve controls, and replacing gates in the gate chamber. The event includes technical presentations, an acquisition overview, and a guided site visit of the dam, including the outlet works, gate chamber, and spillway. Interested contractors must RSVP by September 30, 2026, by emailing the requested attendee information and a signed Federal Non-Disclosure Agreement (NDA) to receive draft plans and specifications. Due to confined space requirements, attendees wishing to enter the outlet works must comply with Reclamation’s FIST 1-1 hazardous energy protocols, bring a personal keyed lock, and wear appropriate personal protective equipment. This announcement is for information-gathering purposes only and does not constitute a formal solicitation.

This government document details the Bureau of Reclamation's Hazardous Energy Control Program (HECP), specifically outlining the requirements and procedures for the Special Work Permit (SWP) process under Facilities Instructions, Standards, and Techniques Volume 1-1 (FIST 1-1). Designed for contractors and agency representatives working on or near equipment at Reclamation-owned facilities, the program ensures compliance with OSHA standards for hazardous energy control and information transfer. Before work begins, contractors must establish their own written HECP and coordinate closely with a designated Reclamation Representative to assess hazards and define the scope of work. All tasks requiring hazardous energy controls must be documented on an SWP (Form POM-215). Under this permit, the Contractor’s Workplace Representative must follow strict energy isolation procedures, including applying personal locks to isolation devices or clearance lockboxes, visually verifying safety controls, and coordinating the placement of Personal Protective Grounds (PPG) if qualified. No work may commence until the SWP is signed and issued, and any changes to the scope of work require a new permit. Upon project completion, the contractor must clear the work area of all tools, ensure PPGs are removed, verify that all personnel are safe, and sign off to release the SWP back to Reclamation. This program establishes a rigorous safety framework to protect on-site personnel from hazardous energy risks during federal contracting operations.

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This Request for Information (RFI) issued by the Bureau of Reclamation, United States Department of the Interior, seeks industry feedback regarding the upcoming Conconully Dam construction project in Okanogan County, Washington. The government is gathering information from potential contractors to identify construction challenges, risks, and logistical constraints before issuing a formal Request for Proposal (RFP). The RFI poses eight specific questions addressing key project complexities. These include navigating large-scale rock excavation without blasting due to dam proximity, and managing complex water diversion and unwatering logistics to maintain required irrigation and non-irrigation creek flows. Additionally, the agency seeks feedback on potential operational disruptions from reservoir water-level management, remote area crew lodging availability, and the potential impact of a Project Labor Agreement (PLA) requirement on bidding interest. Finally, the RFI asks contractors to identify sequencing challenges, major risks at the 60% design stage, and the necessity of non-typical or multiple work shifts under local county noise ordinances. Interested parties must submit their responses, limited to 15 pages, to the designated Contracting Officer and Contract Specialist by July 29, 2026.

This project overview from the U.S. Bureau of Reclamation outlines the upcoming Conconully Safety of Dams Modification Project in north-central Washington. Aimed at reducing seismic vulnerability and preventing catastrophic failure of the Conconully Dam, the infrastructure project will feature deep soil mixing across the downstream foundation and the construction of a large downstream stability berm with integrated drainage layers. Additional major upgrades involve the outlet works system, which requires steel lining, grout encasement, slide gate replacements, outlet conduit extensions, a new concrete valve vault housing downstream control valves, and rock excavation without explosives. The existing control house and gatehouse will also be demolished and replaced. The selected contractor must maintain continuous reservoir operations, irrigation deliveries, and minimum stream flows throughout construction, necessitating close coordination with Reclamation during seasonal flow changes. While construction will impact local wetlands and Salmon Creek, Reclamation is handling habitat mitigation and site revegetation under separate contracts. An Industry Day is planned for October 2026, with the official solicitation anticipated in the third quarter of Fiscal Year 2027.

This federal government document package contains draft technical engineering drawings and plan details for the Conconully Dam Seismic Modifications project, part of the Okanogan Project in Washington State. Prepared by the Bureau of Reclamation under the U.S. Department of the Interior, the project focuses on executing critical seismic safety upgrades, foundation treatments, and infrastructure modifications. The engineering drawings outline several key work areas, including: - **Site Layout & Excavation:** Comprehensive plans for the main project site, Graveyard Flat Borrow Area excavation, right/left abutment rock excavations, and downstream stability berm grading. - **Foundation & Seismic Treatments:** Details for deep soil mixing (DSM) foundation treatments, stability berm sand filters, gravel drains, and drainage blankets. - **Drainage & Relief Systems:** Extensive configurations for a new toe drain system, relief wells, collector pipes, and associated inspection vaults. - **Structural & Tunnel Modifications:** Architectural and structural designs for modifying the existing outlet works tunnel, extending the steel-lined concrete conduit, and constructing a new valve house, gate house, and stilling basin. - **Environmental & Utility Controls:** Coordination plans defining contractor use limits, environmental avoidance boundaries (such as wetlands and the Conconully Cemetery), bypass pumping locations for winter flows, and existing instrument/piezometer abandonment and protection protocols. These designs serve as the technical foundation for the physical modification and reinforcement of the dam structures to mitigate seismic risks.