Knife Rive Corp. is one of the largest producers of building materials in the United States. Based in Portland, Ore., its core products include aggregate, asphalt, ready-mix concrete, liquid asphalt and cement. The company provides an array of construction services and specialty services for both the private and public sectors. Some of its products include building materials/tools/hardware, as well as masonry, among others. Knife Rive Corp. offers services, such as highway construction, landfill and marine construction, petroleum recycling and many more. It is a subsidiary of MDU Resources Group Inc.