<SEC-DOCUMENT>0000940394-18-000176.txt : 20180131
<SEC-HEADER>0000940394-18-000176.hdr.sgml : 20180131
<ACCEPTANCE-DATETIME>20180131160922
ACCESSION NUMBER:		0000940394-18-000176
CONFORMED SUBMISSION TYPE:	497
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20180131
DATE AS OF CHANGE:		20180131
EFFECTIVENESS DATE:		20180131

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			EATON VANCE SENIOR FLOATING RATE TRUST
		CENTRAL INDEX KEY:			0001258623
		IRS NUMBER:				000000000

	FILING VALUES:
		FORM TYPE:		497
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-207589
		FILM NUMBER:		18562760

	BUSINESS ADDRESS:	
		STREET 1:		TWO INTERNATIONAL PLACE
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02110
		BUSINESS PHONE:		617-482-8260

	MAIL ADDRESS:	
		STREET 1:		TWO INTERNATIONAL PLACE
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02110

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	EATON VANCE SENIOR FLOATING RATE FUND
		DATE OF NAME CHANGE:	20030806
</SEC-HEADER>
<DOCUMENT>
<TYPE>497
<SEQUENCE>1
<FILENAME>sfrtprosaisupp.htm
<DESCRIPTION>EATON VANCE SENIOR FLOATING-RATE TRUST PROSPECTUS AND SAI SUPPLEMENT DTD 1-31-2018
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<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 0 9pt 0 0; text-align: center"><B>EATON VANCE SENIOR FLOATING-RATE TRUST</B></P>

<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 0 9pt 0 0; text-align: center"><B>Supplement to Prospectus dated February
23, 2017</B></P>

<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 6pt 0"><B>The following changes are effective January 31, 2018:</B></P>

<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 3pt 0 6pt"><B>1. The following replaces the sixth paragraph under &#8220;Investment
Objectives, Policies and Risk&#8221; in &#8220;Prospectus Summary&#8221; in the Prospectus:</B></P>

<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 0">Scott H. Page and Craig P. Russ are portfolio managers of the Trust.
Mr. Page is a Vice President of Eaton Vance, is Co-Director of Eaton Vance&#8217;s Floating Rate Loan Group and has been a portfolio
manager of the Trust since November 2003. Mr. Russ is a Vice President of Eaton Vance, is Co-Director of Eaton Vance&#8217;s Floating
Rate Loan Group and has been a portfolio manager of the Trust since November 2003.</P>

<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 3pt 0 6pt"><B>2. The following replaces the third paragraph under &#8220;The
Adviser&#8221; in &#8220;Management of the Trust&#8221; in the Prospectus:</B></P>

<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 0">Scott H. Page and Craig P. Russ comprise the investment team responsible
for the overall and day-to-day management of the Trust&#8217;s investments. Mr. Page is a Vice President of Eaton Vance, is Co-Director
of Eaton Vance&#8217;s Floating Rate Loan Group and has been a portfolio manager of the Trust since November 2003. Mr. Russ, is
a Vice President of Eaton Vance, is Co-Director of Eaton Vance&#8217;s Floating Rate Loan Group and has been a portfolio manager
of the Trust since November 2003.</P>

<P STYLE="font: 10pt NewsGoth Lt BT; margin: 6pt 0 6pt 0.25in">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; border-collapse: collapse">
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    <TD STYLE="width: 49%; padding-top: 6pt; padding-bottom: 3pt; font: 10pt NewsGoth Dm BT"><FONT STYLE="font-family: Arial, Helvetica, Sans-Serif">January 31, 2018</FONT></TD>
    <TD STYLE="width: 51%; padding-top: 6pt; padding-bottom: 3pt; text-align: right; font: 10pt NewsGoth Dm BT">&nbsp;</TD></TR>
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<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 3pt 0 0">&nbsp;</P>


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<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 10pt/101% Arial, Helvetica, Sans-Serif; margin: 0; text-align: center"><B>EATON VANCE SENIOR FLOATING-RATE TRUST</B></P>

<P STYLE="font: 10pt/101% Arial, Helvetica, Sans-Serif; margin: 0 0 0 14.1pt; text-align: center"><FONT STYLE="letter-spacing: -0.05pt"><B>Supplement
to Statement of Additional Information dated </B></FONT><B>February 23, 2017</B></P>

<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 3pt 0">&nbsp;</P>

<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 0.5pt 0 3pt">&nbsp;</P>

<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 3pt 0"><B>1. The following replaces the first table under &#8220;Portfolio
Managers.&#8221; in &#8220;Investment Advisory and Other Services&#8221;:</B></P>

<P STYLE="font: 9pt Arial, Helvetica, Sans-Serif; margin: 3pt 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" ALIGN="CENTER" STYLE="width: 100%; font: 9pt NewsGoth XCn BT; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 21%; padding: 3pt 5.4pt; text-align: center; line-height: 10pt">&nbsp;</TD>
    <TD STYLE="width: 12%; border-bottom: Black 1pt solid; padding: 3pt 5.4pt; text-align: center; line-height: 10pt; vertical-align: bottom"><FONT STYLE="font-family: Arial, Helvetica, Sans-Serif; font-size: 8pt"><B>Number of</B></FONT><BR>
<FONT STYLE="font-family: Arial, Helvetica, Sans-Serif; font-size: 8pt"><B>All Accounts</B></FONT></TD>
    <TD STYLE="width: 15%; border-bottom: Black 1pt solid; padding: 3pt 5.4pt; text-align: center; line-height: 10pt; vertical-align: bottom"><FONT STYLE="font-family: Arial, Helvetica, Sans-Serif; font-size: 8pt"><B>Total Assets of</B></FONT><BR>
<FONT STYLE="font-family: Arial, Helvetica, Sans-Serif; font-size: 8pt"><B>All Accounts</B></FONT></TD>
    <TD STYLE="width: 24%; border-bottom: Black 1pt solid; padding: 3pt 5.4pt; text-align: center; line-height: 10pt; vertical-align: bottom"><FONT STYLE="font-family: Arial, Helvetica, Sans-Serif; font-size: 8pt"><B>Number of Accounts</B></FONT><BR>
<FONT STYLE="font-family: Arial, Helvetica, Sans-Serif; font-size: 8pt"><B>Paying a Performance Fee</B></FONT></TD>
    <TD STYLE="width: 28%; border-bottom: Black 1pt solid; padding: 3pt 5.4pt; text-align: center; line-height: 10pt; vertical-align: bottom"><FONT STYLE="font-family: Arial, Helvetica, Sans-Serif; font-size: 8pt"><B>Total Assets of Accounts</B></FONT><BR>
<FONT STYLE="font-family: Arial, Helvetica, Sans-Serif; font-size: 8pt"><B>Paying a Performance Fee</B></FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding: 6pt 5.4pt 3pt 13.7pt; line-height: 10pt"><FONT STYLE="font-family: Arial, Helvetica, Sans-Serif; font-size: 8pt">Scott H. Page</FONT></TD>
    <TD STYLE="padding: 6pt 5.4pt 3pt; line-height: 10pt">&nbsp;</TD>
    <TD STYLE="padding: 6pt 5.4pt 3pt; line-height: 10pt">&nbsp;</TD>
    <TD STYLE="padding: 6pt 5.4pt 3pt; line-height: 10pt">&nbsp;</TD>
    <TD STYLE="padding: 6pt 5.4pt 3pt; line-height: 10pt">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding: 3pt 5.4pt 3pt 2.9pt; line-height: 10pt"><FONT STYLE="font-family: Arial, Helvetica, Sans-Serif; font-size: 8pt">Registered Investment Companies</FONT></TD>
    <TD STYLE="padding: 3pt 19.45pt 3pt 5.4pt; text-align: center; line-height: 10pt"><FONT STYLE="font-family: Arial, Helvetica, Sans-Serif; font-size: 8pt">13</FONT></TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt"><FONT STYLE="font-family: Arial, Helvetica, Sans-Serif; font-size: 8pt">$22,030.4</FONT></TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt"><FONT STYLE="font-family: Arial, Helvetica, Sans-Serif; font-size: 8pt">0</FONT></TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt"><FONT STYLE="font-family: Arial, Helvetica, Sans-Serif; font-size: 8pt">$0</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding: 3pt 5.4pt 3pt 2.9pt; line-height: 10pt"><FONT STYLE="font-family: Arial, Helvetica, Sans-Serif; font-size: 8pt">Other Pooled Investment Vehicles</FONT></TD>
    <TD STYLE="padding: 3pt 19.45pt 3pt 5.4pt; text-align: center; line-height: 10pt"><FONT STYLE="font-family: Arial, Helvetica, Sans-Serif; font-size: 8pt">12</FONT></TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt"><FONT STYLE="font-family: Arial, Helvetica, Sans-Serif; font-size: 8pt">$8,685.4</FONT></TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt"><FONT STYLE="font-family: Arial, Helvetica, Sans-Serif; font-size: 8pt">1</FONT></TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt"><FONT STYLE="font-family: Arial, Helvetica, Sans-Serif; font-size: 8pt">$2.4</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding: 3pt 5.4pt 3pt 2.9pt; line-height: 10pt"><FONT STYLE="font-family: Arial, Helvetica, Sans-Serif; font-size: 8pt">Other Accounts</FONT></TD>
    <TD STYLE="padding: 3pt 19.45pt 3pt 5.4pt; text-align: center; line-height: 10pt"><FONT STYLE="font-family: Arial, Helvetica, Sans-Serif; font-size: 8pt">8</FONT></TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt"><FONT STYLE="font-family: Arial, Helvetica, Sans-Serif; font-size: 8pt">$4,702.1</FONT></TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt"><FONT STYLE="font-family: Arial, Helvetica, Sans-Serif; font-size: 8pt">0</FONT></TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt"><FONT STYLE="font-family: Arial, Helvetica, Sans-Serif; font-size: 8pt">$0</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding: 6pt 5.4pt 3pt 13.7pt; line-height: 10pt"><FONT STYLE="font-family: Arial, Helvetica, Sans-Serif; font-size: 8pt">Craig P. Russ</FONT></TD>
    <TD STYLE="padding-top: 6pt; padding-right: 19.45pt; padding-bottom: 3pt; text-align: center; line-height: 10pt">&nbsp;</TD>
    <TD STYLE="padding: 6pt 5.4pt 3pt; text-align: center; line-height: 10pt">&nbsp;</TD>
    <TD STYLE="padding: 6pt 5.4pt 3pt; text-align: center; line-height: 10pt">&nbsp;</TD>
    <TD STYLE="padding: 6pt 5.4pt 3pt; text-align: center; line-height: 10pt">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding: 3pt 5.4pt 3pt 2.9pt; line-height: 10pt"><FONT STYLE="font-family: Arial, Helvetica, Sans-Serif; font-size: 8pt">Registered Investment Companies</FONT></TD>
    <TD STYLE="padding: 3pt 19.45pt 3pt 5.4pt; text-align: center; line-height: 10pt"><FONT STYLE="font-family: Arial, Helvetica, Sans-Serif; font-size: 8pt">9</FONT></TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt"><FONT STYLE="font-family: Arial, Helvetica, Sans-Serif; font-size: 8pt">$17,496.9</FONT></TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt"><FONT STYLE="font-family: Arial, Helvetica, Sans-Serif; font-size: 8pt">0</FONT></TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt"><FONT STYLE="font-family: Arial, Helvetica, Sans-Serif; font-size: 8pt">$0</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding: 3pt 5.4pt 3pt 2.9pt; line-height: 10pt"><FONT STYLE="font-family: Arial, Helvetica, Sans-Serif; font-size: 8pt">Other Pooled Investment Vehicles</FONT></TD>
    <TD STYLE="padding: 3pt 19.45pt 3pt 5.4pt; text-align: center; line-height: 10pt"><FONT STYLE="font-family: Arial, Helvetica, Sans-Serif; font-size: 8pt">4</FONT></TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt"><FONT STYLE="font-family: Arial, Helvetica, Sans-Serif; font-size: 8pt">$6,136.9</FONT></TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt"><FONT STYLE="font-family: Arial, Helvetica, Sans-Serif; font-size: 8pt">0</FONT></TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt"><FONT STYLE="font-family: Arial, Helvetica, Sans-Serif; font-size: 8pt">$0</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding: 3pt 5.4pt 3pt 2.9pt; line-height: 10pt"><FONT STYLE="font-family: Arial, Helvetica, Sans-Serif; font-size: 8pt">Other Accounts</FONT></TD>
    <TD STYLE="padding: 3pt 19.45pt 3pt 5.4pt; text-align: center; line-height: 10pt"><FONT STYLE="font-family: Arial, Helvetica, Sans-Serif; font-size: 8pt">8</FONT></TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt"><FONT STYLE="font-family: Arial, Helvetica, Sans-Serif; font-size: 8pt">$4,702.1</FONT></TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt"><FONT STYLE="font-family: Arial, Helvetica, Sans-Serif; font-size: 8pt">0</FONT></TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt"><FONT STYLE="font-family: Arial, Helvetica, Sans-Serif; font-size: 8pt">$0</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 6pt 0">&nbsp;</P>

<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 3pt 0"><B>2. The following replaces the second table under &#8220;Portfolio
Managers.&#8221; in &#8220;Investment Advisory and Other Services&#8221;:</B></P>

<P STYLE="font: 9pt/101% Arial, Helvetica, Sans-Serif; margin: 0 5.85pt 0 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" ALIGN="CENTER" STYLE="font: 9pt NewsGoth XCn BT; width: 80%; border-collapse: collapse">
<TR STYLE="vertical-align: bottom">
    <TD STYLE="width: 22%; border-bottom: Black 1pt solid; padding: 3pt 5.4pt 3pt 2.9pt; line-height: 10pt"><FONT STYLE="font-family: Arial, Helvetica, Sans-Serif; font-size: 8pt"><B>Portfolio Manager</B></FONT></TD>
    <TD STYLE="width: 38%; border-bottom: Black 1pt solid; padding: 3pt 5.4pt; text-align: center; line-height: 10pt"><FONT STYLE="font-family: Arial, Helvetica, Sans-Serif; font-size: 8pt"><B>Dollar Range of Equity Securities</B></FONT><BR>
<FONT STYLE="font-family: Arial, Helvetica, Sans-Serif; font-size: 8pt"><B>Beneficially Owned in the Trust</B></FONT></TD>
    <TD STYLE="width: 40%; border-bottom: Black 1pt solid; padding: 3pt 5.4pt; text-align: center; line-height: 10pt"><FONT STYLE="font-family: Arial, Helvetica, Sans-Serif; font-size: 8pt"><B>Aggregate Dollar Range of Equity</B></FONT><BR>
<FONT STYLE="font-family: Arial, Helvetica, Sans-Serif; font-size: 8pt"><B>Securities Beneficially Owned in</B></FONT><BR>
<FONT STYLE="font-family: Arial, Helvetica, Sans-Serif; font-size: 8pt"><B>the Eaton Vance Family of Funds</B></FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding: 6pt 5.4pt 3pt 2.9pt; line-height: 10pt"><FONT STYLE="font-family: Arial, Helvetica, Sans-Serif; font-size: 8pt">Scott H. Page</FONT></TD>
    <TD STYLE="padding: 6pt 5.4pt 3pt; text-align: center; line-height: 10pt"><FONT STYLE="font-family: Arial, Helvetica, Sans-Serif; font-size: 8pt">$100,001 - $500,000</FONT></TD>
    <TD STYLE="padding: 6pt 5.4pt 3pt; text-align: center; line-height: 10pt"><FONT STYLE="font-family: Arial, Helvetica, Sans-Serif; font-size: 8pt">Over $1,000,000</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding: 3pt 5.4pt 3pt 2.9pt; line-height: 10pt"><FONT STYLE="font-family: Arial, Helvetica, Sans-Serif; font-size: 8pt">Craig P. Russ</FONT></TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt"><FONT STYLE="font-family: Arial, Helvetica, Sans-Serif; font-size: 8pt">$10,001 - $50,000</FONT></TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt"><FONT STYLE="font-family: Arial, Helvetica, Sans-Serif; font-size: 8pt">Over $1,000,000</FONT></TD></TR>
</TABLE>
<P STYLE="font: 9pt/101% Arial, Helvetica, Sans-Serif; margin: 0 5.85pt 0 0">&nbsp;</P>

<P STYLE="font: 9pt/101% Arial, Helvetica, Sans-Serif; margin: 0 5.85pt 0 0">&nbsp;</P>

<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 7.25pt 0 3pt 6pt"><FONT STYLE="letter-spacing: -0.05pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 7.25pt 0 3pt"><FONT STYLE="letter-spacing: -0.05pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 7.25pt 0 3pt 6pt"><FONT STYLE="letter-spacing: -0.05pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 7.25pt 0 3pt 6pt"><FONT STYLE="letter-spacing: -0.05pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 7.25pt 0 3pt 6pt"><FONT STYLE="letter-spacing: -0.05pt">January 31,
2018</FONT></P>


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