Northwest Pipe Co. operates as a manufacturer of engineered steel pipe water systems in North America. It operates through the following segments: Engineered Steel Pressure Pipe and Precast Infrastructure and Engineered Systems. The Engineered Steel Pressure Pipe segment manufactures large-diameter, high-pressure steel pipeline systems for use in water infrastructure applications, which are primarily related to drinking water systems, hydroelectric power systems, wastewater systems, industrial plant piping systems, certain structural applications and other applications. Precast Infrastructure and Engineered Systems segment manufactures high-quality precast and reinforced concrete products, including manholes, box culverts, vaults, catch basins, oil water separators, pump lift stations, biofiltration, and other environmental and engineered solutions. The company was founded in 1966 and is headquartered in Vancouver, WA.