Keweenaw Upper Breakwater Repairs

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Contract Opportunity

This Invitation for Bid (IFB) is being solicited as unrestricted. The United States Army Corps of Engineers (USACE) owns and maintains the West Breakwater in the Keweenaw Waterway (Upper) Entry near Houghton, Michigan. The breakwater is approximately 2,645 feet long and consists of timber crib and rubble mound construction. The inner 845 feet is a timber crib with concrete cap covered in armor stone. The remaining 1,800 feet of the breakwater is rock filled timber crib covered in armor stone. The breakwater was constructed as part of several projects that began in 1898 with the outer 1,800 feet finished in 1933. Rehabilitation projects have also been completed on the breakwater with the last occurring in the early 2000s. Non-native stamp sand is currently migrating through and/or over the breakwater into the Federally Authorized Channel which is increasing the frequency and costs related to keeping the channel at its authorized depth. The breakwater will be modified by increasing the height and providing filter material to prevent passage of stamp sand material through and/or over the breakwater into the channel. Improvements will be completed from STA 0+30 to STA 4+00 with optional improvements from STA 4+00 to STA 4+50. The work includes the excavation, hauling, and disposal of stamp sand within the specified confined disposal facility, the excavation and rework of existing armor stone, and supply and placement of bedding stone (D-Stone), core stone (C-Stone), and armor stone (A-Stone), and incidental related work.

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