SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                    FORM 8-K

                                 CURRENT REPORT
                       PURSUANT TO SECTION 13 OR 15(D) OF
                       THE SECURITIES EXCHANGE ACT OF 1934


       Date of Report (Date of earliest event reported): SEPTEMBER 1, 1999
                                                         -----------------


                            MICHAEL BAKER CORPORATION
                            -------------------------
             (Exact name of registrant as specified in its charter)


PENNSYLVANIA                             1-6627                25-0927646
- ------------                             ------                ----------
(State or other                        (Commission          (I.R.S. Employer
jurisdiction of incorporation)          File Number)         Identification No.)


AIRPORT OFFICE PARK, BUILDING 3, 420 ROUSER ROAD, CORAOPOLIS, PA     15108
- ----------------------------------------------------------------     -----
(Address of principal executive offices)                             (Zip Code)


       Registrant's telephone number, including area code: (412) 269-6300
                                                           --------------





ITEM 2.  ACQUISITION OR DISPOSITION OF ASSETS.
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(a) On September 1, 1999, Baker/MO Services,  Inc. ("Baker/MO"),  a wholly-owned
subsidiary of Michael Baker  Corporation (the  "Company"),  purchased all of the
outstanding shares of capital stock of Steen Production Service, Inc. ("Steen"),
a Louisiana  corporation,  from its  shareholders,  Messrs. J. Orville Steen and
Stephen P. Roan (the "Sellers").  Steen is an operations and maintenance company
which  provides  pumping and gauging  services to oil and gas  facilities in the
Gulf of Mexico. Steen has annual revenues totaling approximately $17 million and
about 300 full-time operations, supervisory and administrative personnel.

The  purchase  price  (the  "Purchase  Price")  for  the  shares  of  Steen  was
$10,951,063,  including  promissory  notes  totaling  $4,380,425,  which will be
repaid to the Sellers in two equal annual  installments,  and including  certain
non-competition covenants valued at $2,000,000. Interest on the promissory notes
will  accrue from  September  1, 1999 at the prime rate as  announced  by Mellon
Bank,  N.A., and also will be paid in two annual  installments.  The Company has
guaranteed  Baker/MO's  obligation to repay all principal and interest under the
promissory  notes. In addition,  the Company,  through its Baker/MO  subsidiary,
entered into five-year employment agreements with each of the Sellers.

The Purchase Price was determined through negotiation between the parties. Funds
used to pay the portion of the Purchase Price due to the Sellers at closing were
borrowed under the Company's $25 million credit agreement with Mellon Bank, N.A.

Steen's   assets   comprise   primarily   liquid  items   consistent   with  the
service-oriented   nature  of  their  business.   Customer  accounts  receivable
typically represents  approximately  two-thirds of Steen's total assets. Steen's
remaining assets comprise cash and cash equivalents, other miscellaneous current
assets and certain fixed assets,  primarily marine equipment required to operate
the business.

(b) The  Company  currently  intends  that all of the Steen  fixed  assets  will
continue to be deployed in the  ordinary  course of operating  Steen's  existing
business.


ITEM 7.  FINANCIAL STATEMENTS AND EXHIBITS.
         ----------------------------------

(a) It is  impracticable to file herewith the financial  statements  required by
this Item. Such financial statements shall be filed as soon as practicable,  but
not later than November 15, 1999.






(b) It is  impracticable  to file  herewith the pro forma  financial  statements
required by this Item.  Such pro forma  financial  statements  shall be filed as
soon as practicable, but not later than November 15, 1999.

(c) The exhibit identified below is filed herewith as a part of this report. The
Company hereby agrees to furnish to the Commission,  upon request, a copy of any
omitted schedule or exhibit to the agreement identified below.

    Exhibit 10.1  Stock Purchase Agreement by and among Baker/MO Services, Inc.,
                  Steen Production Service, Inc., J. Orville Steen and
                  Stephen P. Roan


                                   SIGNATURES

Pursuant  to the  requirements  of the  Securities  Exchange  Act of  1934,  the
registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned hereunto duly authorized.


                                    MICHAEL BAKER CORPORATION

Date:  September 15, 1999           /s/  J. ROBERT WHITE
                                    -------------------------------------------
                                    J. Robert White
                                    Executive Vice President, Chief
                                     Financial Officer and Treasurer