Gorge Dam Powerhouse Rockfall Mitigation

The City of Seattle, Department of Finance and Administrative Services, is requesting bids for rockfall mitigation installation at Gorge Dam Powerhouse in Whatcom County, Washington under PW# 2026-020, with bids due July 15, 2026 and mandatory pre-bid site inspections on June 29 or June 30 at 10:00 a.m. in Newhalem. Bidders must be registered Washington State contractors with current industrial insurance coverage and valid UBI and contractor registration numbers. Compliance with prevailing wage requirements under RCW 39.12, Seattle's Paid Sick and Safe Time ordinance, and WISHA standards is mandatory.

The scope consists of installation of rock dowels and cable lashings positioned behind and upslope of the powerhouse structure. Qualified personnel must include a project manager and superintendent with a minimum of three years of experience supervising rock dowel, cable lashing, and wire rope anchor installations. Contractors must demonstrate completion of at least three similar projects within the last five years covering both rock dowel and cable lashing installation. Work must begin immediately upon Notice to Proceed and achieve physical completion within 80 working days.

The Engineer's estimate is $220,000 before tax, with state sales tax at 8.3% added to the awarded contract price. A bid guaranty of not less than 5% of the maximum bid amount is required in the form of a cashier's check, certified check, or bid bond. Liquidated damages are assessed at $500 per working day for failure to achieve Substantial Completion and $250 per working day thereafter until Physical Completion.

The apparent low bidder must submit the Supplemental Bidder Responsibility Criteria Form and supporting documentation within three business days of request. Written questions are due by 5:00 p.m. Thursday before the July 15 bid opening. Bids will be opened at 2:00 p.m. via Microsoft Teams. Seattle Municipal Code Chapter 20.42 equal opportunity employment and affirmative efforts in solicitation of women, minority, and WMBE firms apply.