Knife River Prestress is a national and regional award-winning leader in the precast/prestressed concrete industry. Since 1958 we have produced a wide range of precast/ prestressed concrete products and associated support services. Our well-equipped manufacturing facility is located at Harrisburg, in the central Willamette Valley of Oregon. From this location we serve Oregon, Washington, Idaho, Nevada and California.


Morse Bros. Company was started by the three Morse brothers, Joe, Forrest and Bill in 1941 as a supplier of sand and gravel from their first pit in Harrisburg, Oregon. Services and materials offered to the construction industries expanded to include ready-mix, highway construction services and material for roads and highways. In 1958 Morse Bros. built its structural prestressing plant in a nearby field in Harrisburg to supply prestressed girders for new highway construction throughout Oregon and the Northwest.

The precast and prestressed industry throughout the United States organized and began developing design, manufacturing and quality standards that are still today the foundation of all precast/prestressed concrete. This organization is the Precast/Prestressed Concrete Institute (PCI).

In 1967, Morse Bros. became one of PCI's earliest certified plants and we remain one of the major PCI producers in the Northwest. Dick Imper, general manager in 1994, served as national chairman of PCI. Morse Bros. prestressed division has been a leader in the northwest in developing and producing new generations of precast bridge members and other construction products. Morse Bros. has also been a leader in designing and producing other concrete products such as precast post-tensioned concrete fluid storage tanks, frame members and seat riser units for arenas and outside stadiums, electric power transmission poles, and support structures and enclosures for industrial process facilities.

In 1973 Morse Bros. added the current architectural precast and prestressing plant at the 42-acre Harrisburg facility. Morse Bros. has and continues to produce architectural precast and/or prestressed concrete building cladding and framing components as well as moment frame beam/column components for buildings and elevated parking garages.

1998 was the year that Morse Bros. took advantage of an opportunity to broaden their horizon by becoming a member of the Knife River Corporation family of companies, a fully integrated independently managed and operated construction materials and mining company headquartered in Bismarck, North Dakota. Knife River is part of MDU Resources Group, Inc. (NYSE: MDU). Knife River operates in Alaska, Oregon, California, Montana, and Wyoming providing high quality construction materials and related services.


Knife River Corporation will be the supplier of choice in providing quality construction materials and services that benefit our customers and build strong communities.