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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 CRbJjPCud8vm3A1umMIiGAtIgOmahqFWWZYEx6sN/fQUrAEvYP0xsDNxanXCZaPI
 u0ijGsGuyenjdawukPQGxA==

<SEC-DOCUMENT>0000921530-05-000496.txt : 20050722
<SEC-HEADER>0000921530-05-000496.hdr.sgml : 20050722
<ACCEPTANCE-DATETIME>20050722161521
ACCESSION NUMBER:		0000921530-05-000496
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20050708
FILED AS OF DATE:		20050722
DATE AS OF CHANGE:		20050722

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Baker Skardon F
		CENTRAL INDEX KEY:			0001319491

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-12108
		FILM NUMBER:		05968911

	BUSINESS ADDRESS:	
		BUSINESS PHONE:		213-830-6357

	MAIL ADDRESS:	
		STREET 1:		333 SOUTH GRAND AVENUE, 28TH FLOOR
		CITY:			LOS ANGELES
		STATE:			CA
		ZIP:			90071

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			CRIMSON EXPLORATION INC.
		CENTRAL INDEX KEY:			0000813779
		STANDARD INDUSTRIAL CLASSIFICATION:	CRUDE PETROLEUM & NATURAL GAS [1311]
		IRS NUMBER:				870444770
		STATE OF INCORPORATION:			TX
		FISCAL YEAR END:			0228

	BUSINESS ADDRESS:	
		STREET 1:		480 N. SAM HOUSTON PARKWAY EAST
		STREET 2:		SUITE 300
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			77060
		BUSINESS PHONE:		2818201919

	MAIL ADDRESS:	
		STREET 1:		480 N. SAM HOUSTON PARKWAY EAST
		STREET 2:		SUITE 300
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			77060

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	GULFWEST ENERGY INC
		DATE OF NAME CHANGE:	20010523

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	GULFWEST OIL CO
		DATE OF NAME CHANGE:	19960515

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	GULFWEST ENERGY INC//
		DATE OF NAME CHANGE:	19920924
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2005-07-08</periodOfReport>

    <issuer>
        <issuerCik>0000813779</issuerCik>
        <issuerName>CRIMSON EXPLORATION INC.</issuerName>
        <issuerTradingSymbol>CXPI</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001319491</rptOwnerCik>
            <rptOwnerName>Baker Skardon F</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O OAKTREE CAPITAL MANAGEMENT, LLC</rptOwnerStreet1>
            <rptOwnerStreet2>333 S. GRAND AVENUE, 28TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>LOS ANGELES</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>90071</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
                <footnoteId id="F1"/>
            </securityTitle>
            <transactionDate>
                <value>2005-07-08</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>D</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>17045</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                    <footnoteId id="F3"/>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">On June 29, 2005, Crimson Exploration Inc., a Delaware corporation, became the successor issuer of Gulfwest Energy Inc., a Texas corporation, pursuant to a merger.  The merger had the effect of changing the company's domicile, but did not alter the proportionate interests of security holders.</footnote>
        <footnote id="F2">As previously reported, on June 1, 2005, the board of directors approved a restricted stock award to the reporting person representing 17,045 shares of common stock.  The award was rescinded by the board of directors when the reporting person elected not to receive the award.</footnote>
        <footnote id="F3">The reporting person is a Vice President of Oaktree Capital Management, LLC (&quot;Oaktree&quot;).  Oaktree is the managing member of the OCM Principal Opportunities Fund III GP, LLC (&quot;Fund GP&quot;), the general partner of OCM Principal Opportunities Fund III, L.P. (&quot;Fund&quot;) and OCM Principal Opportunities Fund IIIA, L.P. (&quot;Fund IIIA&quot;), the direct beneficial owners of OCM GW Holdings, LLC (&quot;Holdings&quot;).  Holdings is a 10% owner of the Issuer.  Fund is the managing member of Holdings.  Each of Fund, Fund GP, Oaktree and the members of Oaktree may be deemed an indirect beneficial owner of the securities reported on this Form 4 and each hereby disclaims beneficial ownership of the reported shares.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Skardon F. Baker</signatureName>
        <signatureDate>2005-07-11</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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