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<isDirector>1</isDirector><isOfficer>0</isOfficer><isTenPercentOwner>1</isTenPercentOwner><isOther>0</isOther></reportingOwnerRelationship></reportingOwner><nonDerivativeTable><nonDerivativeTransaction><securityTitle><value>Common Units representing limited partner interests</value></securityTitle><transactionDate><value>2003-12-01</value></transactionDate><transactionCoding><transactionFormType>4</transactionFormType><transactionCode>M</transactionCode><equitySwapInvolved>0</equitySwapInvolved><footnoteId id="F1"/></transactionCoding><transactionAmounts><transactionShares><value>7830924</value></transactionShares><transactionPricePerShare><footnoteId id="F2"/></transactionPricePerShare><transactionAcquiredDisposedCode><value>A</value></transactionAcquiredDisposedCode></transactionAmounts><postTransactionAmounts><sharesOwnedFollowingTransaction><value>8910618</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value><footnoteId id="F3"/><footnoteId id="F4"/></directOrIndirectOwnership><natureOfOwnership><value/><footnoteId id="F3"/><footnoteId id="F4"/></natureOfOwnership></ownershipNature></nonDerivativeTransaction></nonDerivativeTable><derivativeTable><derivativeTransaction><securityTitle><value>Class B Common Units representing limited partner interests</value></securityTitle><conversionOrExercisePrice><footnoteId id="F5"/></conversionOrExercisePrice><transactionDate><value>2003-12-01</value></transactionDate><transactionCoding><transactionFormType>4</transactionFormType><transactionCode>M</transactionCode><equitySwapInvolved>0</equitySwapInvolved><footnoteId id="F1"/></transactionCoding><transactionAmounts><transactionShares><value>7830924</value></transactionShares><transactionPricePerShare><footnoteId id="F7"/></transactionPricePerShare><transactionAcquiredDisposedCode><value>D</value></transactionAcquiredDisposedCode></transactionAmounts><exerciseDate><footnoteId id="F8"/></exerciseDate><expirationDate><footnoteId id="F6"/></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common Units representing limited partner interests</value></underlyingSecurityTitle><underlyingSecurityShares><value>7830924</value></underlyingSecurityShares></underlyingSecurity><postTransactionAmounts><sharesOwnedFollowingTransaction><value>0</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value><footnoteId id="F3"/></directOrIndirectOwnership><natureOfOwnership><value/><footnoteId id="F3"/></natureOfOwnership></ownershipNature></derivativeTransaction></derivativeTable><footnotes><footnote id="F1">The transaction described herein is also exempt under Rule 16b-6(b) as the conversion of a derivative security, thus Transaction Code C is also applicable.</footnote><footnote id="F2">Magellan Midstream Holdings, L.P. converted 7,830,924 shares of Class B Common Units into an equal number of Common Units on December 1, 2003.</footnote><footnote id="F3">These securities are owned by Magellan Midstream Holdings, L.P. (formerly WEG Acquisitions, L.P.), which is a member of a &quot;group&quot; for purposes of Section 13(d) of the Exchange Act including Magellan Midstream Management, LLC (formerly WEG Acquisition Mangement, LLC), Carlyle/Riverstone MLP Holdings, L.P., Carlyle/Riverstone Energy Partners II, L.P., C/R Energy GP II, LLC, Riverstone Holdings LLC, Madison Dearborn Capital Partners IV, L.P., Madison Dearborn Partners IV, L.P., Madison Dearborn Partners, L.L.C., and other entities not jointly filing on this Form 4.  Magellan Midstream Holdings, L.P. directly owns all securities reported on this Form 4, and all the other joint filers' ownership form is indirect, through one or more subsidiaries. </footnote><footnote id="F4">The joint filers are jointly filing this Form 4 and information regarding the joint filers other than Magellan Midstream Holdings, L.P. is set forth on Exhibit 99 to this Form 4.  The reporting persons disclaim beneficial ownership of the reported securities except to the extent of their pecuniary interests therein, and this report shall not be deemed an admission that the reporting persons are beneficial owners of the reported securities for purposes of Section 16 or for any other purpose.</footnote><footnote id="F5">1-for-1</footnote><footnote id="F6">None</footnote><footnote id="F7">Not Applicable</footnote><footnote id="F8">Immediately</footnote></footnotes><remarks/><ownerSignature><signatureName>John D. Chandler, Chief Financial Officer of Magellan Midstream Management, LLC, general partner of Magellan Midstream Holdings, L.P.</signatureName><signatureDate>2003-12-03</signatureDate></ownerSignature></ownershipDocument>

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<HTML><BODY><PRE>Joint Filer Information



Name: Magellan Midstream Management, LLC (formerly WEG Acquisition Management, LLC)

Address:  One Williams Center

Tulsa, Oklahoma 74172

Designated Filer: Magellan Midstream Holdings, L.P.

Issuer & Ticker Symbol: Magellan Midstream Partners, L.P. (MMP)

Date of Event Requiring Statement: 12/1/2003





Name:  Riverstone Holdings LLC

Address:  1 Greenwich Office Park

   Greenwich, Connecticut 06831

Designated Filer: Magellan Midstream Holdings, L.P.

Issuer & Ticker Symbol: Magellan Midstream Partners, L.P. (MMP)

Date of Event Requiring Statement: 12/1/2003





Name:  Carlyle/Riverstone MLP Holdings, L.P.

Name:  Carlyle/Riverstone Energy Partners II, L.P.

Name:  C/R Energy GP II, LLC

Address:  c/o The Carlyle Group

1001 Pennsylvania Avenue, N.W.

Suite 220 South

Washington, D.C. 20004-2505

Designated Filer: Magellan Midstream Holdings, L.P.

Issuer & Ticker Symbol: Magellan Midstream Partners, L.P. (MMP)

Date of Event Requiring Statement: 12/1/2003

______________________________________________________________________________



Name:  Madison Dearborn Capital Partners IV, L.P.

Name:  Madison Dearborn Partners IV, L.P.

Name:  Madison Dearborn Partners, L.L.C.

Address:  Three First National Plaza

   Suite 3800

   Chicago, Illinois 60602

Designated Filer: Magellan Midstream Holdings, L.P.

Issuer & Ticker Symbol: Magellan Midstream Partners, L.P. (MMP)

Date of Event Requiring Statement: 12/1/2003







Signatures of Reporting Persons



MAGELLAN MIDSTREAM MANAGEMENT, LLC



By: /s/ John D. Chandler  Date:12/1/2003_

Name: John D. Chandler

 Title: Chief Financial Officer, Vice President

           and Treasurer



CARLYLE/RIVERSTONE MLP PARTNERS, L.P.



By: Carlyle/Riverstone Energy Partners II, L.P.

Its: General Partner



By: C/R Energy GP II, LLC

Its: General Partner



By: /s/ Pierre F. Lapeyre, Jr.  Date: 12/1/2003_

Name: Pierre F. Lapeyre, Jr.

 Title:  Managing Director



CARLYLE/RIVERSTONE ENERGY PARTNERS II, L.P.



By: C/R Energy GP II, LLC

Its: General Partner



By: /s/ Pierre F. Lapeyre, Jr.  Date:12/1/2003_

Name: Pierre F. Lapeyre, Jr.

 Title:  Managing Director



C/R ENERGY GP II, LLC



By: /s/ Pierre F. Lapeyre, Jr.  Date: 12/1/2003_

Name: Pierre F. Lapeyre, Jr.

 Title:  Managing Director



RIVERSTONE HOLDINGS, LLC



By: /s/ Pierre F. Lapeyre, Jr.  Date: 12/1/2003_

Name: Pierre F. Lapeyre, Jr.

 Title:  Managing Director





MADISON DEARBORN CAPITAL PARTNERS IV, L.P.



By: Madison Dearborn Partners IV, L.P.

Its:  General Partner



By: Madison Dearborn Partners, L.L.C.

Its:  General Partner



By: /s/ Justin S. Huscher  Date: 12/1/2003_

Name: Justin S. Huscher

 Title :  Managing Director



MADISON DEARBORN PARTNERS IV, L.P.



By: Madison Dearborn Partners, L.L.C.

Its:  General Partner



By: /s/ Justin S. Huscher  Date: 12/1/2003_

Name: Justin S. Huscher

 Title :  Managing Director



MADISON DEARBORN PARTNERS, L.L.C.



By: /s/ Justin S. Huscher  Date: 12/1/2003_

Name: Justin S. Huscher

 Title :  Managing Director









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