Orion Group Holdings, Inc. operates as a specialty construction company in the building, industrial, and infrastructure sectors in the continental United States, Alaska, Canada, and the Caribbean Basin. It operates in two segments, Marine and Concrete. The company provides various marine construction services, including construction, restoration, dredging, maintenance, and repair of marine transportation facilities and pipelines, bridges and causeways, and marine environmental structures. Its marine transportation facility projects comprise public port facilities; cruise ship port facilities; private terminals; special-use navy terminals; recreational use marinas and docks; and other marine-based facilities. The company also offers on-going maintenance and repair, inspection, emergency repair, and demolition and salvage services to marine transportation facilities. Its marine pipeline service projects consist of the installation and removal of underwater buried pipeline transmission li