Marine Infrastructure

IMCO Construction specializes in the environmental and logistical constraints of working around sensitive marine ecosystems and active waterways. IMCO restores salmon habitat and protects wetlands and marine environments with technical and logistical expertise in dewatering, pile driving and removal, and slope stabilization, in collaboration with our public and private customer partners and their specific needs.

Foss Maritime & Bulkhead Repairs

In February 2021 the existing bulkhead wall at the Foss Maritime shipyard in Seattle began deflecting into the ship canal. The uplands behind the wall were excavated and large concrete blocks were used to hold the wall back to...

Mukilteo Ferry Terminal

The Mukilteo-Clinton ferry route connects Whidbey Island to the Seattle-Everett metropolitan area, the system’s busiest route for vehicle traffic and the second highest in annual ridership, with over four million total riders annually. The new terminal won many design...

Keller Ferry Terminal Improvements

The Keller Ferry Terminal project involved the replacement of pontoons, approach spans, decking, structural framing, railing, anchors, mooring components, coating systems, and the relocation of electrical and mechanical systems at the Washington State Keller Ferry Terminal. IMCO was allotted...

Meydenbauer Beach and Marina Revitalization

This contract included restoration work for both the developed and undeveloped areas of Meydenbauer Beach Park and Bellevue Marina. IMCO constructed a pedestrian pier and a beach house with restrooms, a lifeguard station, covered outdoor spaces, and natural landscaping...

Harris Avenue Shipyard Cleanup

IMCO was awarded this contract in March 2017 to dredge and make infrastructure improvements around the Fairhaven Shipyard property near the Bellingham Cruise Terminal on Harris Avenue in Bellingham, Washington.About half of the cleanup project was funded through the...

Skagit Wildlife Area Fir Island Farm Ecosystem Restoration

The Fir Island Farm Ecosystem Restoration project was located on the Washington State Department of Fish and Wildlife’s (WDFW) Snow Goose Reserve at Fir Island, west of Conway, Washington. The WDFW Snow Goose Reserve is comprised of 245 acres...

Tacoma Central Treatment Plant Flood Protection

The primary component of the project involved installing 2,500 lineal feet of sheet pile floodwall around the Southern and Northern portion of the City of Tacoma’s Central Wastewater Treatment Plant. The contract also involved construction of five floodgates, three...

Terminal 117 Cleanup

This significant and complex environmental project for the Port of Seattle was located along the west bank of the Lower Duwamish Waterway in South Park. It removed upland soil and river sediment to reduce hazardous material and contaminants to levels that would protect...