SEATTLE--(BUSINESS WIRE)--July 3, 2006--Plum Creek Timber Company,Inc. (NYSE:PCL) today announced that Martin A. White, chairman of theboard and chief executive officer of MDU Resources Group, Inc., hasjoined Plum Creek's board of directors.

Prior to joining MDU, White worked for 22 years at the MontanaPower Company. During his time there, he served in several rolesincluding managing the company's mining, oil company, technology andreal estate subsidiaries. White also lived in South America where heestablished a new mining venture. He later returned to the UnitedStates and started his own consulting company.

White joined MDU Resources Group, Inc. in 1991 as vice presidentof corporate development, and became president and chief executiveofficer in 1998 and chairman in 2001. MDU Resources Group, Inc. is adiversified natural resource company that provides energy, naturalresource products and related services to both U.S. and internationalmarkets.

"Martin's impressive career includes management of naturalresource and real estate assets," said Rick Holley, president andchief executive officer. "His perspective in these areas will be ofgreat value to Plum Creek. We are very pleased that he has agreed tojoin our board."

White earned a bachelor's degree in mathematics and economics fromMontana State University and is a graduate of Harvard University'sAdvanced Management Program and Senior Executive Update. He alsoserves on the board of First Interstate BancSystem, Inc. and onnumerous community boards.

Plum Creek is the largest and most geographically diverse privatelandowner in the nation with more than 8 million acres of timberlandsin major timber producing regions of the United States and 10 woodproducts manufacturing facilities in the Northwest.

CONTACT: Plum Creek Timber Company, Inc.
Investors:
John Hobbs, 800-858-5347
or
Media:
Kathy Budinick, 206-467-3620

SOURCE: Plum Creek Timber Company, Inc.