Knife River 

Knife River Corporation provides aggregates-based construction materials and contracting services in the United States. It operates through six segments: Pacific, Northwest, Mountain, North Central, South, and Energy Services. The company mines, processes, and sells construction aggregates, including crushed stone and sand, and gravel; and produces and sells asphalt and ready-mix concrete, as well as provides contracting services to support the aggregate-based product lines, including heavy-civil construction, asphalt and concrete paving, and site development and grading. It serves federal, state, and municipal governments for various projects, such as highways, bridges, airports, schools, public buildings, and other public-infrastructure projects. The company was founded in 1917 and is based in Bismarck, North Dakota.