QuickLinks -- Click here to rapidly navigate through this document

Exhibit 21.1

Subsidiaries of CH2M HILL Companies, Ltd.

1.

Operations Management International Inc., a California corporation

2.

CH2M HILL, Inc., a Florida corporation

3.

CH2M HILL Hanford, Inc., a Washington corporation

4.

CH2M HILL Engineers, Inc., a Delaware corporation

5.

CH2M HILL Constructors, Inc., a Delaware corporation

6.

CH2M HILL International, Ltd., a Delaware corporation

7.

CH2M HILL Alaska, Inc., an Alaskan company

8.

CH2M HILL Canada, Inc., a Canadian corporation

QuickLinks

Subsidiaries of CH2M HILL Companies, Ltd.