-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
 MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen
 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 HEWteDGyLFt0xDSPmEftsHTpzoXZM4m8LYusFR41qmfC258yljm6DacK6WDpLWFK
 DznlFPORfKduZl7w1Y7wAw==

<SEC-DOCUMENT>0000830260-03-000020.txt : 20030822
<SEC-HEADER>0000830260-03-000020.hdr.sgml : 20030822
<ACCEPTANCE-DATETIME>20030822121859
ACCESSION NUMBER:		0000830260-03-000020
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20030821
FILED AS OF DATE:		20030822

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			MONTROSS SCOTT J
		CENTRAL INDEX KEY:			0001228503

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-09887
		FILM NUMBER:		03861808

	BUSINESS ADDRESS:	
		STREET 1:		C/O NATIONAL STEEL CORP
		STREET 2:		4100 EDISON LAKES PARKWAY
		CITY:			MISHAWAKA
		STATE:			IN
		ZIP:			48545
		BUSINESS PHONE:		5742737854

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			OREGON STEEL MILLS INC
		CENTRAL INDEX KEY:			0000830260
		STANDARD INDUSTRIAL CLASSIFICATION:	STEEL WORKS, BLAST FURNACES  ROLLING MILLS (COKE OVENS) [3312]
		IRS NUMBER:				940506370
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		1000 SW BROADWAY
		STREET 2:		STE 2200
		CITY:			PORTLAND
		STATE:			OR
		ZIP:			97205
		BUSINESS PHONE:		5032405788

	MAIL ADDRESS:	
		STREET 1:		PO BOX 5368
		CITY:			PORTLAND
		STATE:			OR
		ZIP:			97228
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>montrossf382103_ex.xml
<TEXT>
<XML>
<?xml version="1.0"?>
<!-- - EDGAR Ease Plus 1.0                                   07/25/03  TT    -->
<ownershipDocument>
    <schemaVersion>X0201</schemaVersion>

    <documentType>3</documentType>
   <periodOfReport>2003-08-21</periodOfReport>
    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0000830260</issuerCik>
        <issuerName>OREGON STEEL MILLS INC</issuerName>
        <issuerTradingSymbol>OS</issuerTradingSymbol>
   </issuer>
   <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001228503</rptOwnerCik>
            <rptOwnerName>MONTROSS SCOTT J</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O OREGON STEEL MILLS, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>1000 S.W. BROADWAY, STE. 2200</rptOwnerStreet2>
            <rptOwnerCity>PORTLAND</rptOwnerCity>
            <rptOwnerState>OR</rptOwnerState>
            <rptOwnerZipCode>97205</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
            <reportingOwnerRelationship>
         <isDirector>0</isDirector>
         <isOfficer>1</isOfficer>
         <isTenPercentOwner>0</isTenPercentOwner>
         <isOther>0</isOther>
         <officerTitle>VP/Sales &amp; Marketing</officerTitle>
      </reportingOwnerRelationship>
   </reportingOwner>
 <nonDerivativeTable>
   <nonDerivativeHolding>
      <securityTitle>
         <value>Common Stock</value>
      </securityTitle>
      <postTransactionAmounts>
         <valueOwnedFollowingTransaction>
           <value>0</value>
         </valueOwnedFollowingTransaction>
      </postTransactionAmounts>
      <ownershipNature>
         <directOrIndirectOwnership>
            <value>D</value>
         </directOrIndirectOwnership>
      </ownershipNature>
   </nonDerivativeHolding>
 </nonDerivativeTable>
   <ownerSignature>
      <signatureName>/s/ Jeff S. Stewart</signatureName>
      <signatureDate>2003-08-21</signatureDate>
   </ownerSignature>
</ownershipDocument>

</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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