#### **EXHIBIT 21**

 

**Washington Group International, Inc.Subsidiaries**

 
| **Company  Name**                                           | ** ** | **Jurisdiction** | ** ** |
|-------------------------------------------------------------|------------|------------------|------------|
| 21st Century  Rail Corporation                              |       | Delaware         |       |
| Badger  Energy Inc.                                         |       | Delaware         |       |
| Badger  Middle East, Inc.                              |       | Delaware         |       |
| Badger-SMAS  Ltd.                                           |       | Saudi Arabia     |       |
| Broadway  Insurance Company, Ltd.                           |       | Bermuda          |       |
| CH2M-WG  Idaho, LLC                                         |       | Idaho            |       |
| Catalytic  Servicios C.A.                                   |       | Venezuela        |       |
| Constructora  MK de Mexico, S.A. de C.V.                    |       | Mexico           |       |
| Cosa-United  C.A.                                           |       | Venezuela        |       |
| Dulles  Transit Partners, LLC                               |       | Virginia         |       |
| Ebasco  International Corporation                           |       | Delaware         |       |
| Energy  Overseas International Inc.                         |       | Delaware         |       |
| FD/MK  Limited Liability Company                            |       | Delaware         |       |
| GIBSIN  Engineers, Ltd                                      |       | Taiwan,  R.O.C.  |       |
| Global  Energy Services LLC                                 |       | Delaware         |       |
| Hampton  Roads Public-Private Development, LLC              |       | Virginia         |       |
| Harbert-Yeargin  Inc                                        |       | Delaware         |       |
| Johnson  Controls Northern New Mexico, LLC                  |       | New Mexico       |       |
| Leasing  Corporation (The)                                  |       | Nevada           |       |
| Los Alamos  National Security, LLC                          |       | Delaware         |       |
| MK Aviation  Services, Inc.                            |       | Nevada           |       |
| MK Engineers  and Contractors, S.A. de C.V.                 |       | Mexico           |       |
| MK Nevada  LLC                                              |       | Nevada           |       |
| MKF  Facilities Management Ltd.                             |       | Ireland          |       |
| MKK Leasing  General Partnership                            |       | Nevada           |       |
| Mibrag B.V.                                                 |       | Netherlands      |       |
| Middle East  Holdings Limited                               |       | Colorado         |       |
| Mitteldeutsche  Braunkohlengesellschaft mbH                 |       | Germany          |       |
| Morrison  Knudsen Engenharia S.A.                           |       | Brazil           |       |
| Morrison  Knudsen Fort Knox Project Limited, L.L.C.         |       | Ohio             |       |
| Morrison  Knudsen MISR LLC, a Limited Liability Company     |       | Egypt            |       |
| Morrison  Knudsen Peru Services S.A.                        |       | Peru             |       |
| Morrison  Knudsen Peru Sociedad de Responsabilidad Limitada |       | Peru             |       |
| Morrison  Knudsen Umwelt GmbH                               |       | Germany          |       |
| Morrison  Knudsen Venezuela, S.A.                           |       | Venezuela        |       |
| National  Projects, Inc.                               |       | Nevada           |       |
| PT Morrison  Knudsen Indonesia                              |       | Indonesia        |       |
| PT Power  Jawa Barat                                        |       | Indonesia        |       |

 

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| **Company  Name**                                        | ** ** | **Jurisdiction** | ** ** |
|----------------------------------------------------------|------------|------------------|------------|
| Parkway  Group LLC                                       |       | Georgia          |       |
| Platte River  Constructors, Ltd.                         |       | Ohio             |       |
| Pomeroy  Corporation                                     |       | California       |       |
| Ralph Tyler  Services, Ltd.                              |       | Ohio             |       |
| Raytheon  Engineers & Constructors Germany GmbH |       | Germany          |       |
| Raytheon  Engineers & Constructors Italy S.r.L. |       | Italy            |       |
| Raytheon-Ebasco  Overseas Ltd.                           |       | Delaware         |       |
| Rocky  Mountain Remediation Services LLC                 |       | Colorado         |       |
| Rust  Constructors Inc.                                  |       | Delaware         |       |
| Rust  Constructors Puerto Rico, Inc.                |       | Nevada           |       |
| Safe Sites  of Colorado L.L.C.                           |       | Delaware         |       |
| Shanghai  EBASCO/ECEPDI Engineering Corporation          |       | China            |       |
| Steam  Generating Team LLC, (The)                        |       | Ohio             |       |
| THOR  Treatment Technologies, LLC                        |       | Delaware         |       |
| Targhee  Overseas Services LLC                           |       | Delaware         |       |
| United  Engineers Far East, Ltd.                         |       | Delaware         |       |
| United  Engineers International, Inc.               |       | Pennsylvania     |       |
| United Mid  East Saudi Arabia                            |       | Saudi Arabia     |       |
| United  Mid-East, Inc.                              |       | Delaware         |       |
| W.Z.S.  Limited                                          |       | England          |       |
| WGCI, Inc.                                          |       | Delaware         |       |
| WGI Asia  Pacific Pte. Ltd.                              |       | Singapore        |       |
| WGI  Asia, Inc.                                     |       | Delaware         |       |
| WGI Global  Inc.                                         |       | Nevada           |       |
| WGI  Industrial Services, Ltd.                           |       | Ohio             |       |
| WGI Middle  East (UK) Ltd.                               |       | United  Kingdom  |       |
| WGI Middle  East Inc.                                    |       | Nevada           |       |
| WGI  Netherlands B.V.                                    |       | Netherlands      |       |
| WSMS  Mid-America LLC                                    |       | Delaware         |       |
| WSMS-MK LLC                                              |       | Tennessee        |       |
| Washington  ACE LLP                                      |       | United  Kingdom  |       |
| Washington  Architects, LLC                              |       | Delaware         |       |
| Washington  Closure Company LLC                          |       | Washington       |       |
| Washington  Closure Hanford LLC                          |       | Delaware         |       |
| Washington  Construction Corporation                     |       | Montana          |       |
| Washington  Demilitarization Company, LLC                |       | Delaware         |       |
| Washington  E & C Limited                       |       | United  Kingdom  |       |
| Washington  E&C Romania S.R.L.                       |       | Romania          |       |
| Washington  Earth Tech Disposal Cell (WEDC) LLC          |       | Tennessee        |       |
| Washington  Electrical, Inc.                        |       | Nevada           |       |
| Washington  Engineering Quality Services Corporation     |       | Delaware         |       |
| Washington  Engineers LLP                                |       | Puerto Rico      |       |
| Washington  Engineers PSC                                |       | Puerto Rico      |       |

 

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| **Company  Name**                                                                  | ** ** | **Jurisdiction**      | ** ** |
|------------------------------------------------------------------------------------|------------|-----------------------|------------|
| Washington  Enterprises Emirates LLC                                               |       | United Arab  Emirates |       |
| Washington  Group (Malaysia) Sdn Bhd                                               |       | Malaysia              |       |
| Washington  Group Argentina, Inc.                                             |       | Nevada                |       |
| Washington  Group BWXT Operating Services, LLC                                     |       | Delaware              |       |
| Washington  Group Bolivia S.R.L.                                                   |       | Bolivia               |       |
| Washington  Group Deutschland GmbH                                                 |       | Germany               |       |
| Washington  Group Engineering Consulting (Shanghai) Co., Ltd.                      |       | China                 |       |
| Washington  Group Industrial GmbH                                                  |       | Germany               |       |
| Washington  Group International Hungary Kft                                        |       | Hungary               |       |
| Washington  Group International Trading (Shanghai) Co., Ltd.                       |       | China                 |       |
| Washington  Group International do Brasil Ltda.                                    |       | Brazil                |       |
| Washington  Group International, Inc. (an Ohio corporation)                   |       | Ohio                  |       |
| Washington  Group Ireland Ltd.                                                     |       | Delaware              |       |
| Washington  Group Latin America, Inc.                                         |       | Delaware              |       |
| Washington  Group NTS LLC                                                          |       | Delaware              |       |
| Washington  Group Northern Ltd.                                                    |       | Canada                |       |
| Washington  Group Polska Sp. z o.o.                                                |       | Poland                |       |
| Washington  Group Romania S.R.L.                                                   |       | Romania               |       |
| Washington  Infrastructure Corporation                                             |       | New York              |       |
| Washington  Infrastructure Services, Inc.                                     |       | Colorado              |       |
| Washington  International B.V.                                                     |       | Netherlands           |       |
| Washington  International Holding Limited                                          |       | United  Kingdom       |       |
| Washington  International, Inc.                                               |       | Nevada                |       |
| Washington  International, LLC                                                     |       | Delaware              |       |
| Washington  Midwest LLC                                                            |       | Ohio                  |       |
| Washington  Ohio Services LLC                                                      |       | Nevada                |       |
| Washington  Quality Inspection Company                                             |       | Delaware              |       |
| Washington  Quality Programs Company                                               |       | Delaware              |       |
| Washington  Safety Management Solutions LLC                                        |       | Delaware              |       |
| Washington  Savannah River Company LLC                                             |       | Delaware              |       |
| Washington  Senggara Sdn Bhd                                                       |       | Malaysia              |       |
| Washington  Services (Thailand) Ltd.                                               |       | Thailand              |       |
| Washington  TRU Solutions LLC                                                      |       | New Mexico            |       |
| Washington  Zander Global Services GmbH                                            |       | Germany               |       |
| Washington-Catalytic, Inc.                                                    |       | Delaware              |       |
| Washington-Framatome  ANP DE&S Decontamination & Decommissioning, LLC |       | New Mexico            |       |
| West Valley  Nuclear Services Company LLC                                          |       | Delaware              |       |
| Westinghouse  Government Environmental Services Company LLC                        |       | Delaware              |       |
| Westmoreland  Resources, Inc.                                                 |       | Delaware              |       |
| Wisconsin  Power Constructors, LLC                                                 |       | Wisconsin             |       |

 

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