Great Lakes Dredge & Dock Corporation has a rich history of engineering, excellence and innovation. Since 1890, we have built and maintained much of the nation’s navigation system, protected our shorelines, restored sensitive habitats, and created other critical aquatic infrastructure. Our team has grown through the addition of other excellent companies, which has broadened our capabilities and expanded our capacity. We are now a full-service provider of infrastructure solutions, including dredging, environmental remediation, demolition and material supply.


In 2010, Great Lakes Dredge & Dock Company acquired the Rivers & Lakes Group, formerly L.W. Matteson, Inc., a dredging and marine construction company. The Rivers & Lakes Group specializes in dredging in challenging shallow water environments, such as lakes, reservoirs, rivers and inland channels. Headquartered in St. Peters, MO, the Rivers & Lakes Group maintains one of the largest fleets of dredging and marine construction equipment in the inland river system. Through this acquisition, Great Lakes successfully entered into a new market, expanding the company’s assets and capabilities for responding within the environmental dredging industry.


Terra Contracting Services, LLC is a premier environmental contracting company that provides exceptional environmental services to clients throughout the United States. The company has earned a reputation for excellence in handling a wide range of projects that include soil, water, and sediment remediation; 24-hour environmental emergency response; industrial cleaning; municipal services; abatement services; hazardous waste removal; and other related services. As the environmental industry has developed over the years, Terra has grown with it, even helping to advance its practices through our own contributions. Our company’s roots reach back to 1952 and, through the decades, we have acquired a wealth of industry knowledge and experience. Terra takes great pride in the quality and safety of our work, which is sustained by a unique management philosophy. This philosophy was tested and refined in the field for more than 50 years before evolving into the six operating principles on which we base all of our decisions and actions.



Magnus Pacific is a self-performing remediation and geotechnical contractor serving private and public sector clients with a comprehensive array of construction capabilities. Our philosophy is to be “Magnus” (Latin for “Great”), completing every project on time, within budget, and without incident, while maintaining the highest project delivery and operational execution standards.