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Proc-Type: 2001,MIC-CLEAR
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<SEC-DOCUMENT>0000940394-07-001987.txt : 20071116
<SEC-HEADER>0000940394-07-001987.hdr.sgml : 20071116
<ACCEPTANCE-DATETIME>20071116151528
ACCESSION NUMBER:		0000940394-07-001987
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20071107
FILED AS OF DATE:		20071116
DATE AS OF CHANGE:		20071116

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			EATON VANCE INSTITUTIONAL SENIOR FLOATING RATE FUND
		CENTRAL INDEX KEY:			0001080310
		IRS NUMBER:				043457431
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		THE EATON VANCE BUILDING
		STREET 2:		255 STATE STREET
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02109
		BUSINESS PHONE:		617-598-8880

	MAIL ADDRESS:	
		STREET 1:		THE EATON VANCE BUILDING
		STREET 2:		255 STATE STREET
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02109

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			RUSS CRAIG P
		CENTRAL INDEX KEY:			0001225711

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	811-09249
		FILM NUMBER:		071253017

	BUSINESS ADDRESS:	
		STREET 1:		EATON VANCE
		STREET 2:		255 STATE STREET
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02109
		BUSINESS PHONE:		6174828260
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>rus34.xml
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2007-11-07</periodOfReport>

    <noSecuritiesOwned>1</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001080310</issuerCik>
        <issuerName>EATON VANCE INSTITUTIONAL SENIOR FLOATING RATE FUND</issuerName>
        <issuerTradingSymbol>EIFRX</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001225711</rptOwnerCik>
            <rptOwnerName>RUSS CRAIG P</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>THE EATON VANCE BUILDING</rptOwnerStreet1>
            <rptOwnerStreet2>255 STATE STREET</rptOwnerStreet2>
            <rptOwnerCity>BOSTON</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02109</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Vice President</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <footnotes></footnotes>

    <ownerSignature>
        <signatureName>By: Paul M. O'Neil / Attorney in Fact</signatureName>
        <signatureDate>2007-11-16</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-24
<SEQUENCE>2
<FILENAME>russpoa.txt
<DESCRIPTION>LIMITED POWER OF ATTORNEY
<TEXT>
Craig P. Russ

                           LIMITED POWER OF ATTORNEY
                                      FOR
                   EATON VANCE CLOSED-END FUNDS COMMON STOCK
                             SECTION 16(a) FILINGS

Know all by these presents, that the undersigned hereby constitutes and appoints
each of Paul M. O'Neil and A. John Murphy,  signing  singly,  the  undersigned's
true and lawful attorney-in-fact to:


(1)  Execute  for and on  behalf of and in the name of the  undersigned,  in the
     undersigned's capacity as an officer,  director and/or stockholder of Eaton
     Vance Closed-End Funds (the  "Companies")  listed in Appendix A Forms 3, 4,
     and 5 and  amendments  thereto  regarding  Common Stock of the Companies in
     accordance  with Section 16(a) of the  Securities  Exchange Act of 1934 and
     the rules thereunder;

(2)  Do and perform any and all acts for and on behalf of the undersigned  which
     may be  necessary  or desirable to complete and execute any such Form 3, 4,
     or 5 or amendment  thereto and timely file such form with the United States
     Securities  and Exchange  Commission  (the "SEC") and any stock exchange or
     similar authority; and

(3)  Take any other action of any type whatsoever  which, in the opinion of such
     attorney-in-fact,  may be necessary or  desirable  in  connection  with the
     foregoing  authority,  it being  understood that the documents  executed by
     such  attorney-in-fact on behalf of the undersigned  pursuant to this Power
     of  Attorney  shall be in such  form  and  shall  contain  such  terms  and
     conditions as such attorney-in-fact may approve.

     The undersigned hereby grants to each such  attorney-in-fact full power and
     authority  to do and  perform  any  and  every  act  and  thing  whatsoever
     requisite,  necessary,  or proper to be done in the  exercise of any of the
     rights and powers herein  granted,  as fully to all intents and purposes as
     the undersigned might or could do if personally present, with full power of
     substitution or revocation,  hereby  ratifying and confirming all that such
     attorney-in-fact,  or such  attorney-in-fact's  substitute or  substitutes,
<PAGE>
     shall  lawfully  do or cause to be done by virtue of this Power of Attorney
     and the rights and powers herein granted. The undersigned acknowledges that
     the foregoing attorneys-in-fact, in serving in such capacity at the request
     of the undersigned,  are not assuming,  nor are the Companies assuming, any
     of the  undersigned's  responsibilities  to comply  with  Section 16 of the
     Securities Exchange Act of 1934 and the rules thereunder.

     This Power of  Attorney  shall  remain in full  force and effect  until the
     undersigned is no longer required to file Forms 3, 4, and 5 with respect to
     the  undersigned's  holdings  of and  transaction  in  Common  Stock of the
     Companies,  unless earlier  revoked by the  undersigned in a signed writing
     delivered to the foregoing attorneys-in-fact. This Power of Attorney may be
     filed  with the SEC as a  confirming  statement  of the  authority  granted
     herein.

     IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be
     executed as of this 1st day of September, 2003.


                                       Craig P. Russ
                                       ---------------------
                                       Print Name of Reporting Person or Entity

                                       /s/ Craig P. Russ
                                       --------------------------
                                       Signature

<PAGE>
                                                                      APPENDIX A

CLOSED-END/INTERVAL FUNDS

Eaton Vance Prime Rate Reserves
EV Classic Senior Floating-Rate Fund
Eaton Vance Advisers Senior Floating-Rate Fund
Eaton Vance Institutional Senior Floating-Rate Fund

The Massachusetts Health & Education Tax-Exempt Trust

Eaton Vance Senior Income Trust
Eaton Vance California Municipal Income Trust
Eaton Vance Florida Municipal Income Trust
Eaton Vance Massachusetts Municipal Income Trust
Eaton Vance Michigan Municipal Income Trust
Eaton Vance Municipal Income Trust
Eaton Vance New Jersey Municipal Income Trust
Eaton Vance New York Municipal Income Trust
Eaton Vance Ohio Municipal Income Trust
Eaton Vance Pennsylvania Municipal Income Trust
Eaton Vance Insured California Municipal Bond Fund
Eaton Vance Insured California Municipal Bond Fund II
Eaton Vance Insured Florida Municipal Bond Fund
Eaton Vance Insured Massachusetts Municipal Bond Fund
Eaton Vance Insured Michigan Municipal Bond Fund
Eaton Vance Insured Municipal Bond Fund
Eaton Vance Insured Municipal Bond Fund II
Eaton Vance Insured New Jersey Municipal Bond Fund
Eaton Vance Insured New York Municipal Bond Fund
Eaton Vance Insured New York Municipal Bond Fund II
Eaton Vance Insured Ohio Municipal Bond Fund
Eaton Vance Insured Pennsylvania Municipal Bond Fund
Eaton Vance Limited Duration Income Fund
Eaton Vance Tax-Advantaged Dividend Income Fund
Eaton Vance Tax-Advantaged Global Dividend Income Fund
Eaton Vance Tax-Advantaged Global Dividend Opportunities Fund
Eaton Vance Senior Floating-Rate Trust
Eaton Vance Floating-Rate Income Trusu
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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