Lake Chelan Power Tunnel Isolation System

This contract awards the design, fabrication, and installation of a 16 ft × 16 ft steel drop‑gate isolation system for the Lake Chelan power tunnel, including a heavy‑duty hoist, concrete foundation, retaining wall, and related mechanical components. The work involves both underwater and over‑water construction, integration of a 125 kW liquid‑propane generator, and modifications to the tunnel inlet bulkhead. It is a medium‑scale, $5.5 million civil‑engineering project for a public utility district in Washington State. • Scope: steel drop‑gate assembly, 50‑ton electric hoist, generator, concrete works, and associated vent/valve components. • Awardee: Ballard Marine Construction LLC (single‑award). • Procurement: Full and open competition, Labor‑and‑Materials solicitation, Time‑and‑Materials pricing.