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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
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<SEC-DOCUMENT>0001179110-04-010467.txt : 20040513
<SEC-HEADER>0001179110-04-010467.hdr.sgml : 20040513
<ACCEPTANCE-DATETIME>20040513200355
ACCESSION NUMBER:		0001179110-04-010467
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20040512
FILED AS OF DATE:		20040513

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			INFRASOURCE SERVICES INC
		CENTRAL INDEX KEY:			0001276827
		STANDARD INDUSTRIAL CLASSIFICATION:	WATER, SEWER, PIPELINE, COMM AND POWER LINE CONSTRUCTION [1623]
		IRS NUMBER:				030523754
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		500 WEST DUTTON MILL RD
		CITY:			ASTON
		STATE:			PA
		ZIP:			19014
		BUSINESS PHONE:		6106193000

	MAIL ADDRESS:	
		STREET 1:		500 WEST DUTTON MILL RD
		CITY:			ASTON
		STATE:			PA
		ZIP:			19014

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	DEARBORN HOLDINGS CORP
		DATE OF NAME CHANGE:	20040116

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			OAKTREE CAPITAL MANAGEMENT LLC
		CENTRAL INDEX KEY:			0000949509
		STATE OF INCORPORATION:			CA
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-32164
		FILM NUMBER:		04804318

	BUSINESS ADDRESS:	
		STREET 1:		333 S GRAND AVENUE 28TH FL
		CITY:			LOS ANGELES
		STATE:			CA
		ZIP:			90071
		BUSINESS PHONE:		2138306300

	MAIL ADDRESS:	
		STREET 2:		333 S GRAND AVE 28TH FL
		CITY:			LOS ANGLES
		STATE:			CA
		ZIP:			90071
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>FORM 4 -
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2004-05-12</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001276827</issuerCik>
        <issuerName>INFRASOURCE SERVICES INC</issuerName>
        <issuerTradingSymbol>IFS</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0000949509</rptOwnerCik>
            <rptOwnerName>OAKTREE CAPITAL MANAGEMENT LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>333 SOUTH GRAND AVENUE, 28TH FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>LOS ANGELES</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>90071</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock, par value $0.001 per share</value>
            </securityTitle>
            <transactionDate>
                <value>2004-05-12</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>100000</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>12.155</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>25538046</value>
                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnote</value>
                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">Oaktree Capital Management, LLC (&quot;Oaktree&quot;), a registered investment adviser under the Investment Advisers Act of 1940, as amended, is the general partner of OCM Principal Opportunities Fund II, L.P. (&quot;POF&quot;) and co-general partner of OCM/GFI Power Opportunities Fund, L.P. (&quot;Power&quot;).  POF is the direct seller of 50,000 shares of the Issuer's Common Stock.  Power is the direct seller of 50,000 shares of the Issuer's Common Stock.</footnote>
        <footnote id="F2">POF is the direct owner of 12,769,012 shares of the Issuer's Common Stock.  Power is the direct owner of 12,769,034 shares of the Issuer's Common Stock.  The reporting person disclaims beneficial ownership of these securities except to the extent of its pecuniary interest therein, and the inclusion of these shares in this report shall not be deemed an admission of beneficial ownership of all of the reported shares for purposes of Section 16 or for any other purpose.</footnote>
        <footnote id="F3">The reporting person is a limited liability company, the members of which are Howard Marks, Bruce Karsh, Sheldon Stone, D. Richard Masson, John Moon, Larry Keele, Kevin Clayton, Stephen Kaplan, Russel Bernard, David Kirchheimer, John Frank, OCM Equity Participation Plan, L.P., Acorn Investors, Inc., and OCM Equity Participation Plan II, L.L.C. Each of such persons may be deemed a beneficial owner of the securities listed herein by virtue of such status as members of the reporting person.  Except to the extent of their respective pecuniary interests therein, each such person disclaims beneficial ownership of the shares listed herein and the filing of this Form 4 shall not be construed as an admission that such person is the beneficial owner of any securities covered by this Form 4.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Oaktree Capital Management, LLC</signatureName>
        <signatureDate>2004-05-13</signatureDate>
    </ownerSignature>
</ownershipDocument>

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