<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2009-03-16</periodOfReport>

    <issuer>
        <issuerCik>0001320934</issuerCik>
        <issuerName>International Coal Group, Inc.</issuerName>
        <issuerTradingSymbol>ICO</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001133521</rptOwnerCik>
            <rptOwnerName>STEELHEAD PARTNERS LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>1301 FIRST AVENUE, SUITE 201</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>SEATTLE</rptOwnerCity>
            <rptOwnerState>WA</rptOwnerState>
            <rptOwnerZipCode>98101</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <otherText>See footnotes</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001327721</rptOwnerCik>
            <rptOwnerName>JOHNSTON JAMES MICHAEL</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>1301 FIRST AVENUE, SUITE 201</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>SEATTLE</rptOwnerCity>
            <rptOwnerState>WA</rptOwnerState>
            <rptOwnerZipCode>98101</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <otherText>See footnotes</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001327722</rptOwnerCik>
            <rptOwnerName>KLEIN BRIAN KATZ</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>1301 FIRST AVENUE, SUITE 201</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>SEATTLE</rptOwnerCity>
            <rptOwnerState>WA</rptOwnerState>
            <rptOwnerZipCode>98101</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <otherText>See footnotes</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2009-03-16</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>11700</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>1.4863</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>10932443</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See footnotes</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">The reporting persons are: (i) Steelhead Partners, LLC (&quot;Steelhead&quot;), a registered investment advisor within the meaning of Rule 16a-1(a)(1)(v) under the Exchange Act; and (ii) each of James Michael Johnston and Brian Katz Klein, Steelhead's member-managers.</footnote>
        <footnote id="F2">The securities reported on this Form 4 are beneficially held by investment limited partnerships and/or client accounts for which Steelhead serves as the general partner and/or  investment manager (the &quot;Funds&quot;).  Each of Steelhead, Mr. Johnston, Mr. Klein and the Funds expressly disclaims beneficial ownership in these securities, except to the extent of their respective pecuniary interests therein.</footnote>
        <footnote id="F3">Although none of the Funds is itself the beneficial owner of more than 10% of the issuer's securities, Steelhead and the other reporting persons may be deemed to beneficially own the securities owned by the Funds insofar as they may be deemed to have the power to direct the voting or disposition of such securities.  The reporting persons have elected therefore to file this Form 4 voluntarily to report the Funds' holdings on an aggregate basis, notwithstanding the reporting exemption applicable to registered investment advisors under Rule 16a-1(a)(1)(v) and to control persons under Rule 16a-1(a)(1)(vii).  The filing of this Form 4 should not, however, be deemed an admission by any of the reporting persons that such person falls outside the scope of the foregoing exemptions, or that the reporting persons and/or the Funds form a group within the meaning of Rule 16a-1(a)(1).</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Steelhead Partners, LLC; By: J. Michael Johnston, its Managing Member; /s/ J. Michael Johnston</signatureName>
        <signatureDate>2009-03-18</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>James Michael Johnston; /s/ J. Michael Johnston</signatureName>
        <signatureDate>2009-03-18</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Brian Katz Klein; /s/ Brian K. Klein</signatureName>
        <signatureDate>2009-03-18</signatureDate>
    </ownerSignature>
</ownershipDocument>
