**Exhibit 21.1**

 

**Subsidiaries of Western GasResources, Inc.**

 
| **Name of Subsidiary** | ** ** | **Relationship**                                                                 |
|------------------------|------------|----------------------------------------------------------------------------------|
|                   |       |                                                                             |
| 1)                     |       | MIGC, Inc., a Delaware  corporation                                         |   | Wholly owned subsidiary of  Western Gas Resources, Inc. |
|                   |       |                                                                             |   |   |
| 2)                     |       | MGTC, Inc., a Wyoming  corporation                                          |   | Wholly owned subsidiary of  MIGC, Inc. |
|                   |       |                                                                             |   |   |
| 3)                     |       | Western Gas Resources -  Texas, Inc., a Texas corporation                   |   | Wholly owned subsidiary of  Western Gas Resources, Inc. |
|                   |       |                                                                             |   |   |
| 4)                     |       | Mountain Gas  Resources, Inc., a Delaware corporation                       |   | Wholly owned subsidiary of  Western Gas Resources, Inc. |
|                   |       |                                                                             |   |   |
| 5)                     |       | Western Power  Services, Inc., a Delaware corporation                       |   | Wholly owned subsidiary of  Western Gas Resources, Inc. |
|                   |       |                                                                             |   |   |
| 6)                     |       | WGR Canada, Inc., a New  Brunswick corporation                              |   | Wholly owned subsidiary of  Western Gas Resources, Inc. |
|                   |       |                                                                             |   |   |
| 7)                     |       | Lance Oil & Gas  Company, Inc., a Delaware corporation             |   | Wholly owned subsidiary of  Western Gas Resources, Inc. |
|                   |       |                                                                             |   |   |
| 8)                     |       | Mountain Gas  Transportation, Inc., a Delaware corporation                  |   | Wholly owned subsidiary of  Mountain Gas Resources, Inc. |
|                   |       |                                                                             |   |   |
| 9)                     |       | Western Gas Wyoming, L.L.C., a  Wyoming L.L.C.                                   |   | Wholly owned subsidiary of  Western Gas Resources, Inc. |
|                   |       |                                                                             |   |   |
| 10)                    |       | Western Gas Resources –  Westana, Inc., a Delaware corporation         |   | Wholly owned subsidiary of  Western Gas Resources, Inc. |
|                   |       |                                                                             |   |   |
| 11)                    |       | Western Gas Resources – Sand  Wash, Inc., a Colorado corporation       |   | Wholly owned subsidiary of  Western Gas Resources, Inc. |
|                   |       |                                                                             |   |   |
| 12)                    |       | Rising Star Pipeline  Corporation, a Delaware corporation                        |   | Wholly owned subsidiary of  Western Gas Resources, Inc. |
|                   |       |                                                                             |   |   |
| 13)                    |       | Setting Sun Pipeline Corporation,  a Delaware corporation                        |   | Wholly owned subsidiary of  Western Gas Resources, Inc. |
|                   |       |                                                                             |   |   |
| 14)                    |       | Western Gas Resources Canada  Company, a Nova Scotia unlimited liability company |   | Wholly owned subsidiary of  Western Gas Wyoming, L.L.C. |
|                        |            |                                                                                  |  |  |  |

 

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