Willbros Re-elects Randy Harl, Peter Leidel and James Taylor and Appoints John McNabb to Board

HOUSTON, Aug. 3 /PRNewswire-FirstCall/ -- Willbros Group, Inc. announced that, at its 2006 annual meeting held August 2, Robert R. (Randy) Harl, Peter A. Leidel and James B. Taylor, Jr. were re-elected to its Board of Directors and shareholders approved an amendment to increase the number of authorized shares of common stock, approved an amendment to the Company's 1996 Stock Plan, approved a new Director Restricted Stock Plan and ratified the appointment of GLO CPAs, LLP, as independent auditors for the 2006 fiscal year. Separately, Willbros announced that John T. McNabb, II has been appointed to the Board of Directors. Mr. McNabb, who holds B.A. and M.B.A degrees from Duke University, is expected to be appointed to the Audit Committee and named its Chairman in the near future. He is Founder and Chairman of the Board of Growth Capital Partners, L.P. and a Director of Warrior Energy Services Corporation. Mr. McNabb is an emeritus member of the Board of Visitors of the Fuqua School of Business at Duke University and a member of the Dean's Advisory Board of the Bauer College of Business at the University of Houston.

Willbros Group, Inc. is an independent contractor serving the oil, gas and power industries, providing construction, engineering and other specialty oilfield-related services to industry and government entities worldwide. The Company's World Wide Web site can be accessed at http://www.willbros.com/.

CONTACT: Michael W. Collier Vice President - Investor Relations Willbros USA, Inc. (713) 403- 8016 Jack Lascar / Partner DRG&E (713) 529-6600