1 Exhibit 21.1 Bell Cement Tools, L.L.C. Guernsey Stone Company Kiewit Materials Leasing L.L.C. Metro Concrete Pumping Company Northwest Materials Holding Company Pacific Rock Products, L.L.C. Pacific Rock Products Trucking, L.L.C. Quality Ready Mix, Inc. Solano Concrete Co., Inc. Tanner Companies (Yuma) Inc. Twin Mountain Rock Company United Metro Materials Inc. (being renamed "United Metro Materials of Arizona Inc.") Western Equipment Co.