EXHIBIT 99.1


                                  CERTIFICATION

I, Joe E. Corvin, President and Chief Executive Officer of Oregon Steel Mills,
Inc., certify that, to the best of my knowledge, the Form 10-Q for the quarterly
period ended September 30, 2002 fully complies with the requirements of section
13(a) or 15(d) of the Securities Exchange Act of 1934 and that information
contained in the Form 10-Q for the quarterly period ended September 30, 2002
fairly presents, in all material respects, the financial condition and results
of operations of Oregon Steel Mills, Inc.





/s/ Joe E. Corvin
-------------------------------------
Joe E. Corvin
President and Chief Executive Officer