**Exhibit 10.3****SUPPLEMENTAL AGREEMENT NO. 6**This Supplemental Agreement No. 6 dated as of September 14, 2006 is entered into by and betweenMICHAEL BAKER CORPORATION, a Pennsylvania corporation (hereinafter referred to as the“Corporation”) and RICHARD L. SHAW, an individual (hereinafter referred to as the “Executive”).WITNESSETH:     WHEREAS, the Corporation and the Executive entered into an Employment Agreement dated April12, 1988 and subsequently amended the Employment Agreement by Supplemental Agreement No. 1 datedMarch 17, 1992, Supplemental Agreement No. 2 dated October 1, 1994, Supplemental Agreement No. 3dated June 1, 1995, Supplemental Agreement No. 4 dated March 1, 1998, and Supplemental AgreementNo. 5, dated September 7, 1999 (hereinafter collectively the “Agreement”); and     WHEREAS, pursuant to the Agreement, the Corporation has retained the Executive as a consultantafter the Executive’s retirement; and     WHEREAS, upon the Corporation’s Chief Executive Officer leaving his employment with theCorporation and at the request of the Corporation’s Board of Directors, the Executive hasre-assumed the full-time position as Chief Executive Officer of the Corporation effective September14, 2006 and has agreed to serve in such capacity until a successor is appointed; and     WHEREAS, the Corporation and the Executive now desire to further amend and supplement theAgreement in recognition of these recent changes in the Executive’s status;     NOW THEREFORE, in consideration of the mutual premises contained herein and other good andvaluable consideration, and intending to be legally bound hereby, THE PARTIES AGREE AS FOLLOWS: 1. Effective September 14, 2006, Executive shall re-assume the full-time positionas Chief Executive Officer of the Corporation with such duties and responsibilities asdescribed in Section 2 of the Agreement, and shall be compensated for his services atan annual rate of $430,497.60 or such higher rate as the Board of Directors of theCorporation may from time to time determine, payable in approximately equal bi-weeklyinstallments.  2. During his service as Chief Executive Officer of the Corporation, Executiveshall be entitled to participate in all plans, programs and receive all benefits whichthe Corporation may have in effect for its executive employees.  3. Commencing October 1, 2006 and during the period the Executive serves asChief Executive Officer of the Corporation, payments and benefits otherwiseavailable to Executive during the Consulting Term under Section 5 of the Agreementshall be suspended, provided that the Corporation shall continue to cover the costof the “65 Special” health insurance and coverage for the Executive and his spousewithout interruption. The Consulting Term shall continue to run during this period,and upon conclusion of Executive’s service as Chief Executive

 
   Officer prior to expiration of the Consulting Term, Executive shall revert toconsultant status and the payments and benefits available under Section 5 shallrecommence for the balance of the Consulting Term.  4. All other terms and conditions of the Agreement shall remain in full force andeffect and are hereby ratified by both parties, and the Agreement is herebyincorporated by reference as if fully stated herein.IN WITNESS WHEREOF, the parties have executed this Supplemental Agreement No. 6 as of the day andyear first above written.        MICHAEL BAKER CORPORATIONATTEST: (The “Corporation”)          /s/ Marcia S. Wolk By: /s/ H. James McKnight     Marcia S. WolkAssistant Secretary   H. James McKnightExecutive Vice President, General Counsel& Corporate Secretary               WITNESS: RICHARD L. SHAW