McMillen Construction

McMillen Construction is a construction company in Vernon Hills, IL, specializing in water-related infrastructure and natural resource projects. The company focuses on dams, hydropower, fish passage, water treatment, and environmental restoration, serving clients across multiple states including California, Washington, Oregon, and Alaska. With a strong emphasis on sustainable solutions, McMillen delivers engineering and construction services for complex projects such as dam rehabilitation, fish hatchery upgrades, and watershed restoration. The company has been in operation for 22 years and maintains a reputation for client retention, with 80% of its work coming from repeat clients. Though it currently has no public reviews, the firm's portfolio reflects a commitment to long-term environmental and engineering excellence.

McMillen operates as a fully employee-owned company, emphasizing expertise across engineering, environmental science, and construction management. Its services span the entire project lifecycle, from initial planning and feasibility studies to final design, construction, and post-project monitoring. The company offers a range of delivery methods, including Design-Build, Construction Management, and EPC contracts, and provides technical guidance in areas such as seismic analysis, sediment modeling, geotechnical investigations, and regulatory compliance. Specialized teams handle dam safety, fish passage systems, hydroelectric licensing, and environmental impact assessments, ensuring projects meet federal and state standards. Their work includes major initiatives such as the Klamath River Renewal Program, the John Horgan Dam Fish Passage project, and multiple hydroelectric relicensing and rehabilitation efforts.

The company is located on Goshen Meadows in Vernon Hills, IL. It serves a broad geographic region through its specialized expertise in water resource infrastructure and environmental restoration. McMillen is known for its technical depth, regulatory experience, and long-term project commitment, consistently delivering solutions that balance engineering precision with ecological responsibility. The firm stands among the leading specialists in dam and water resource projects in the Midwest and Western United States, contributing to the sustainable management of critical natural systems.