Design-Bid-Build

IMCO Construction is building a new eight-million-gallon concrete tank. The prestressed and partially buried tank will store the City of Everett’s drinking water. The current tank is susceptible to seismic damage, and this new structure will provide an upgraded...

IMCO Construction is building the process water treatment facility for a major food company at their new potato processing plant in central Washington. The process water treatment system will treat waste process water and clean through a screening, clarification,...

This project provides improvements to the existing lift station and force main pipes to provide adequate pumping capacity to facilitate future sewage conveyance at the Roeder Lift Station along the downtown Bellingham waterfront. The Roeder Lift Station Capacity Improvements...

IMCO is constructing a 82 megawatt Battery Energy Storage System consisting of 146 battery blocks. The work includes underground electrical, earthwork, concrete foundations, and setting of Prevalon equipment.

Douglas County PUD contracted IMCO Construction to build Washington State’s first large-scale hydrogen production facility, which will use water and power from the Wells Dam facility to produce hydrogen through an electrolysis process. Hydrogen does not emit carbon and...

IMCO constructed two battery energy storage systems (BESS), the first in a series of projects providing the first utility-scale storage systems in the state. The 520 20,000-pound batteries can store 123 megawatts of power. IMCO work included site preparation,...

IMCO installed two 41-foot wide radial gates on the main dam spillway of Thompson Falls Dam. The new radial gates replaced the existing flashboard system and provide Northwestern Energy with additional automated spill capacity. The radial gates were installed...

The Boise Project Board of Control awarded the New York Canal Lining project to IMCO Construction in 2024. IMCO crews replaced one linear mile of canal lining in the canal to enhance the canal’s integrity, improve water conservation, increase...

IMCO Construction performed site preparation, cast-in-place concrete foundations, and set the batteries for a new 40-megawatt battery energy storage system. This is part of the client’s goal to build 1,700 megawatts of battery storage by 2040. The team expedited this...

The Anacortes Ferry Terminal Tollbooth Replacement contract brought upgrades to the 50-year-old facility for Washington State Ferries. This project replaced the existing tollbooths and constructed a new service building, housing a tollbooth, restroom, office space, and an electrical and...

IMCO Construction was contracted hired by General Contractor Hensel Phelps to perform the earthwork, water and wastewater utilities, and pond liners for a client’s datacenter in Kuna, Idaho. The East Kuna Off-Site Infrastructure scope of work includes construction of...

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...

Built in 1961, Oxbow Fish Hatchery is located on the Oregon bank of the Snake River near the Hells Canyon National Recreation Area. The hatchery serves as a trapping, holding, and spawning facility for summer steelhead and spring Chinook...

The primary goal of the project was to improve existing drainage issues at the Anacortes Airport. The airport is a federally funded public airport open 24 hours per day, every day of the year. Crews graded an existing drainage...

This project included major concrete structural repairs to the spillway at the Rock Island Dam. Working over an active spillway, performing an incredibly high-risk task, required careful safety planning and daily coordination with dam operations. Work included demolition of...

After years of planning and additional years of dedication, challenging scope, and inspiring teamwork, all major construction at the Priest Rapids Dam was completed in September 2023. The Priest Rapids Right Embankment Improvement project replaced the existing earthen dam,...

This project won the ENR Northwest Best Project award and went on to win the national competition, the ENR Best of the Best Project in the small project category. Boundary Dam is located on the Pend Oreille River near...

The Orchard Combat Training Center, a 143,000-acre facility located 18 miles south of Boise within the Nelson Snake River Birds of Prey National Conservation Area, serves as a training site for the Idaho National Guard and Army Reserve.  IMCO...

Located in the beautiful foothills northwest of Boise, the town of Eagle is experiencing rapid growth and expansion. IMCO expanded the existing wastewater treatment system with two new aerated lagoon cells and two new settling lagoon cells, resulting in...

This project involved improvements to the floating trash boom system at Rocky Reach Dam in Wenatchee, Washington. The trash boom system is designed to prevent debris from entering the dam. IMCO crews disconnected the existing cable from the upstream...

The Skagit River Pipeline Replacement and Clearwell Construction project included the construction of a new raw water pipeline and a new water storage tank (clearwell). IMCO crews installed a 42-inch diameter pipeline up to 50 feet below the riverbed...

This project involved the removal and disposal of an existing tailrace buoy, its mooring system, and anchor, along with the placement of five district-provided buoy systems to improve dam safety for Chelan County PUD. Work at Rocky Reach Dam...

This fish passage improvement work opened more than 11,000 feet of additional habitat for salmon and Searun Cutthroat trout. IMCO removed three fish barriers under State Route 9 in Whatcom County. The existing round culverts had too steep of...

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...

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...

IMCO Construction completed the construction of a new Final Effluent North (FEN) sodium hypochlorite storage and feed facility as part of an upgrade to the Everett Water Pollution Control Facility. The contract also included modifications to the lagoon dike...

The Stoney Gate Valve Replacement project for the U.S. Army Corps of Engineers (USACE) replaced the original 100-year-old filling culvert gates at the large lock chambers of the Hiram M. Chittenden Locks, also known as the Ballard Locks. IMCO...

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...

This remote project improved fish habitat in the Sultan River, enhancing productivity and survivability for both local and anadromous fish species. The work included tunneling into solid rock at the side of Culmback Dam and constructing a 700-foot water...

IMCO installed two 41-foot wide radial gates on the main dam spillway of Thompson Falls Dam. The new radial gates replaced the existing flashboard system and provide Northwestern Energy with additional automated spill capacity. The radial gates were installed...

This project made improvements to the spillway gates at the Albeni Falls dam for improved operations in sub-zero winter weather. IMCO crews removed 10 spillway gates, replaced the seals with an anti-frees bulb, and installed a de-icing spray system...

IMCO Construction provided extensive upgrades to the existing wastewater treatment plant for the City of Priest River, Idaho. The project brought the facility up current environmental standards and included influent lift station upgrades with screw pump replacement and the...

IMCO Construction made improvements to eastbound 1-90 by replacing select cement concrete panels and shoulders, cement concrete pavement grinding, bituminous pavement grinding, and paving with HMA. Three westbound bridge decks and one eastbound bridge deck were rehabilitated by scarifying,...

IMCO Construction executed this contract to dredge and improve infrastructure around the Fairhaven Shipyard property near the Bellingham Cruise Terminal in Bellingham, Washington. This cleanup project was funded through the Model Toxics Control Act, which was funded through a...

The Yesler Bridge Rehabilitation Project, Yesler Way over 4th Avenue S, was also warded the 2019 ACEC Engineering Excellence, National Silver Award for Structural Systems, multiple APWA awards, and the 2018 ENR Northwest Best Renovation/Restoration project. IMCO Construction rebuilt...

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...

IMCO constructed a new mine water treatment plant at the site of an abandoned copper mine in remote central Washington, near Lake Chelan. IMCO’s client, global mining giant Rio Tinto, is responsible for the clean up of the mine...

In early 2015, IMCO Construction began work on this federally funded highway project in Seattle, Washington valued at over $120 Million. The contract was phase 3 of a three-phase $220 Million project to provide significant improvements to regional mobility,...

Following the catastrophic Oso, WA landslide that covered a mile of the roadway in Northwest Washington, IMCO crews worked around the clock to complete this contract for WSDOT in under a month. The scope included the very careful removal...

IMCO oversaw construction of a federally funded railroad project for the City of Shelby and the Northern Express Transportation Authority. This effort represented the fourth and final phase of a major regional railroad upgrade that relocated a small BNSF...

The Priest Rapids Hatchery Renovation project provided extensive upgrades to an existing hatchery to improve reliability and ease operation, maintenance, and monitoring of Chinook salmon rearing.   All construction work had to be strategically phased to avoid impacts to the...

This project provided traffic congestion relief at the SR-20 and Interstate 5 interchange in Washington State. Improvements were made to the traffic crossings on SR-20 west of Burlington. The highway was widened from two to four lanes for six...

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...

The project provided extensive improvements and upgrades to Arlington’s existing treatment facility. Work included relocation of utilities, new electrical, natural gas, and water services, demolition of existing buildings and structures, the placement of 5,000 cubic yards of structural concrete,...

This project constructed a new 42 million gallon per day water treatment plant for the City of Anacortes. The new treatment facility treats water from the Skagit River and serves the 56,000 customers in the City of Anacortes, La...

IMCO used innovative methods to reuse existing infrastructure in order to construct a new combined sewer overflow project for the City of Port Angeles. The Project was part of the City’s approved CSO Reduction program to increase storage capacity...

The SR 543 Project reconstructed the truck crossing lanes and the US-Canadian Border in Blaine, Washington. Work included construction of two bridges, cast-in-place concrete retaining walls, noise walls and new concrete roadways.  The project was granted substantial completion 176...

The project included construction of a new storm water conveyance and storage system in the Madison Valley basin in Washington Park.  Designed to greatly reduce the potential for flooding, the new storage system in Washington Park holds approximately 1.3 million gallons of storm water...