| Subsidiaries | Jurisdiction of Formation | ||||
| Alaska Basic Industries, Inc. | Alaska | ||||
| Albina Asphalt, LLC | Delaware | ||||
| Ames Sand & Gravel, Inc. | North Dakota | ||||
| Anchorage Sand and Gravel Company, Inc. | Alaska | ||||
| ARC Fabricators, L.L.C. | South Dakota | ||||
| Baldwin Contracting Company, Inc. | California | ||||
| Bearcat Transportation, LLC | Delaware | ||||
| Central Oregon Redi-Mix, LLC | Oregon | ||||
| Concrete, Inc. | California | ||||
| Connolly-Pacific Co. | California | ||||
| D S S Company | California | ||||
| E & ER Company | South Dakota | ||||
| Ellis & Eastern Company | South Dakota | ||||
| Fairbanks Materials, Inc. | Alaska | ||||
| Granite City Ready Mix, Inc. | Minnesota | ||||
| Hawaiian Cement | Hawaii | ||||
| Jebro Incorporated | Iowa | ||||
| JTL Group, Inc. (Montana Corporation) | Montana | ||||
| JTL Group, Inc. (Wyoming Corporation) | Wyoming | ||||
| Kent's Oil Service | California | ||||
| Knife River BenefitCo, LLC | Delaware | ||||
| Knife River Corporation | Delaware | ||||
| Knife River Corporation - Mountain West | Delaware | ||||
| Knife River Corporation - North Central | Minnesota | ||||
| Knife River Corporation - Northwest | Oregon | ||||
| Knife River Corporation - South | Texas | ||||
| Knife River Dakota, Inc. | Delaware | ||||
| Knife River Hawaii, Inc. | Delaware | ||||
| Knife River Marine, Inc. | Delaware | ||||
| Knife River Midwest, LLC | Delaware | ||||
| Knife River Prestress, Inc. | Delaware | ||||
| KRC Holdings, Inc. | Delaware | ||||
| KRC Materials, Inc. | Delaware | ||||
| LTM, Incorporated | Oregon | ||||
| Northstar Materials, Inc. | Minnesota | ||||
| Rail to Road, Inc. | South Dakota | ||||
| Spring Creek Insurance Company | Utah | ||||
| Sweetman Const. Co. | South Dakota | ||||
| WHC, Ltd. | Hawaii | ||||