Knife River Prestress is a national and regional award-winning leader in the precast/prestressed concrete industry. Since 195 ... 8 we have produced a wide range of precast/ prestressed concrete products and associated support services. Our well-equipped manufacturing facilities are located in Harrisburg, the central Willamette Valley of Oregon, and Spokane Washington. From these locations, we serve Oregon, Washington, Idaho, Nevada, and California. Knife River Prestress is focused on creating safe and long term careers for our team members. We continually strive to improve in all aspects of our business and utilize our position as a market leader in prefabricated concrete products to support our staff, their families, and the greater community in which we work. read more