William Kinnune and Brett Wilcox Named to Board of Directors.

Business Editors

PORTLAND, Ore.--(BUSINESS WIRE)--April 29, 2004

Oregon Steel Mills, Inc. (NYSE:OS) announces that William P. Kinnune and Brett E. Wilcox were elected Directors of the Company at the April 29, 2004 Annual Meeting of Stockholders.

Mr. Kinnune is a former

Executive Vice President of Willamette Industries, Inc., a diversified wood products company. While at Willamette Industries, Inc., he held the position of Executive Vice President of the Corrugated, Bags, Specialty Products, Board and Paper from 1985 to 2002. He is a director on the board of AGE Industries, Inc., and serves as director and chairman of the Development Committee of the Portland Oregon Hearing and Speech Institute, and on the Advisory Board of the University of Washington Business School.

Mr. Wilcox is President and owner of Golden Northwest Aluminum, Inc., which owns and operates Northwest Aluminum Company and Goldendale Aluminum Company. He is also Managing Member of Northwest Energy Development, LLC, that is developing efficient natural gas and wind power generating projects. Mr. Wilcox serves as Vice President of the Oregon Progress Board, and on the Boards of Reed College, Oregon Business Council, Citizens for the Columbia River Discovery Center, the Bonneville Environmental Foundation, and the Washington Business Roundtable.

Jim Declusin, President and CEO of Oregon Steel Mills, commented, "We are very pleased that the Company will have the benefit of the broad business experience that Bill and Brett bring to the Board."

Oregon Steel Mills, Inc. is organized into two divisions. The Oregon Steel Division produces steel plate, coil, welded pipe and structural tubing from plants located in Portland, Oregon, Napa, California and Camrose, Alberta, Canada. The Rocky Mountain Steel Mills Division, located in Pueblo, Colorado, produces steel rail, rod, bar, and tubular products.