Preconstruction Services

IMCO Construction and designer Carollo are partnering to replace sewer utilities for the City of Tacoma, performing preconstruction services, evaluating options to determine the best alignment for new large-diameter pipe and a strategy for the re-use of existing pipeline...

IMCO is constructing a 200MW/800MWh Battery Energy Storage System. The work includes installation of 208 battery enclosures for lithium-iron phosphate cells and 52 skids, site preparation, and concrete foundations. 

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,...

The City of Everett owns and operates a water filter plant and regional water distribution system that serves more than 675,000 customers daily. The water filter plant was originally constructed in 1983 and now has aging infrastructure elements in...

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...

IMCO 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.  

This project involved the rehabilitation of 2,500 linear feet of the Tolt Pipeline No. 1 using 54-inch HDPE pipe installed by slip-lining. The scope included connections to an existing 66-inch pipeline, installation of blowoff valves and chambers, construction of...

IMCO Construction brought improvements to the industrial wastewater treatment plant at Darigold’s Caldwell butter plant to allow discharged waste to remain compliant with environmental requirements. Construction crews demolished an existing storage building and constructed a new dissolved air flotation...

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 Lewiston water treatment plant retrofit project has been recognized by the DBIA with a National Award of Merit in the water/wastewater category. IMCO’s progressive design-build team used a creative approach to construction, employed the benefits of the progressive...

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...

Snohomish County and the City of Lynnwood worked together to help ease flooding in the vicinity of the Maple Road and Ash Way/Interurban Trail intersection. Flooding events originating from Swamp Creek, forced multiple intersection closures per year at this...

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...

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 and the major highway was widened from two to four lanes for six miles. The north...

IMCO was the general contractor and construction manager (GCCM) working with Carollo Engineers to add nearly 30% plant capacity. The facility treats wastewater from the cities of Everett, Mukilteo, Alderwood, and Silver Lake to keep the local rivers, lakes, and...

IMCO Construction performed all the earthwork, utilities, and structural concrete phases for the construction of a $1 billion polysilica plant for REC. IMCO accrued over 1,000,000 labor-hours throughout the REC Expansion Project with no lost time injuries through a...

IMCO is proud to provide design-build services for this world-class company on this industrial infrastructure contract. The project provided new structural, architectural, mechanical, and electrical systems to support the installation of a new Multiple Opening Press (MOP). The logistics...

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...

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...