<PAGE>      PAGE  1
000 A000000 09/30/2009
000 C000000 0000863209
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 6.1
000 J000000 A
001 A000000 INVESTORS CASH TRUST
001 B000000 811-06103
001 C000000 2124547190
002 A000000 345 Park Avenue
002 B000000 New York
002 C000000 NY
002 D010000 10154
002 D020000 5808
003  000000 N
004  000000 N
005  000000 N
006  000000 N
007 A000000 Y
007 B000000  1
007 C010200  2
007 C020200 Treasury Portfolio
007 C030200 N
008 A00AA01 DEUTSCHE INVESTMENT MANAGEMENT AMERICAS INC.
008 B00AA01 A
008 C00AA01 801-252
008 D01AA01 NEW YORK
008 D02AA01 NY
008 D03AA01 10154
010 A00AA01 Deutsche Investment Management Americas Inc.
010 B00AA01 801-252
010 C01AA01 New York
010 C02AA01 NY
010 C03AA01 10154
010 A00AA02 State Street Bank & Trust Co.
010 B00AA02 85-11329
010 C01AA02 Boston
010 C02AA02 MA
010 C03AA02 02111
011 A00AA01 DWS INVESTMENTS DISTRIBUTORS, INC.
011 B00AA01 8-47765
011 C01AA01 CHICAGO
011 C02AA01 IL
011 C03AA01 60606
012 A00AA01 DWS INVESTMENTS SERVICE COMPANY
012 B00AA01 84-1713
012 C01AA01 KANSAS CITY
012 C02AA01 MO
<PAGE>      PAGE  2
012 C03AA01 64105
012 A00AA02 DST SYSTEMS, INC.
012 B00AA02 84-00448
012 C01AA02 KANSAS CITY
012 C02AA02 MO
012 C03AA02 64105
013 A00AA01 ERNST & YOUNG LLP
013 B01AA01 BOSTON
013 B02AA01 MA
013 B03AA01 02116
014 A00AA01 Alpha Investment Management S.A.M.
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014 A00AA02 AO DB Securities (Kazakhstan)
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014 A00AA03 BT Opera Trading SA
014 B00AA03 8-000000
014 A00AA04 DB EQUITY LIMITED
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014 A00AA05 DB International (Asia) Limited
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014 A00AA06 DB SECURITIES S.A.
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014 A00AA07 DB Securities Services NJ Inc.
014 B00AA07 8-000000
014 A00AA08 DB UK Bank Limited
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014 A00AA09 DEAM INVESTOR SERVICES, INC.
014 B00AA09 8-000298
014 A00AA10 Deutsche AlAzizia Financial Services
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014 A00AA11 Deutsche Bank Aktiengesellschaft, Filiale
014 B00AA11 8-000000
014 A00AA12 DEUTSCHE BANK CORRETORA DE VALORES SA
014 B00AA12 8-0
014 A00AA13 DEUTSCHE BANK SECURITIES, INC.
014 B00AA13 8-017822
014 A00AA14 DEUTSCHE BANK SECURITIES LIMITED
014 B00AA14 8-0
014 A00AA15 Deutsche Bank Societa per Azioni
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014 A00AA16 Deutsche Bank Zartkoruen Mukodo
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014 A00AA19 Deutsche Equities India Private Limited
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014 A00AA20 Deutsche Futures Singapore Pte Ltd
014 B00AA20 8-0
014 A00AA21 Deutsche Regis Partners Inc
<PAGE>      PAGE  3
014 B00AA21 8-000000
014 A00AA22 DEUTSCHE SECURITIES (INDIA) PRIVATE LIMITED
014 B00AA22 8-0
014 A00AA23 Deutsche Securities (Proprietary) Limited
014 B00AA23 8-000000
014 A00AA24 DEUTSCHE SECURITIES ASIA LIMITED
014 B00AA24 8-0
014 A00AA25 Deutsche Securities Asia Limited, Singapore
014 B00AA25 8-0
014 A00AA26 Deutsche Securities Asia Limited, Taipei
014 B00AA26 8-0
014 A00AA27 Deutsche Securities Australia Limited
014 B00AA27 8-031670
014 A00AA28 DEUTSCHE SECURITIES CORREDORES DE BOLSA LTDA
014 B00AA28 8-0
014 A00AA29 Deutsche Securities Inc.
014 B00AA29 8-000000
014 A00AA30 Deutsche Securities Israel Ltd.
014 B00AA30 8-000000
014 A00AA31 DEUTSCHE SECURITIES KOREA CO.
014 B00AA31 8-0
014 A00AA32 Deutsche Securities Limited
014 B00AA32 8-0
014 A00AA33 Deutsche Securities Menkul Degerler A.S.
014 B00AA33 8-000000
014 A00AA34 Deutsche Securities Sociedad de Bolsa S.A.
014 B00AA34 8-000000
014 A00AA35 Deutsche Securities Venezuela S.A.
014 B00AA35 8-000000
014 A00AA36 Deutsche Securities, S.A. de C.V., Bolsa
014 B00AA36 8-000000
014 A00AA37 DMG & PARTNERS SECURITIES PTE LTD
014 B00AA37 8-0
014 A00AA38 DWS INVESTMENTS DISTRIBUTORS, INC.
014 B00AA38 8-047765
014 A00AA39 K & N Kenanga Holdings Bhd
014 B00AA39 8-000000
014 A00AA40 Kenanga Deutsche Futures Sdn Bhd
014 B00AA40 8-000000
014 A00AA41 Mizuho Corporate Bank (Germany)
014 B00AA41 8-000000
014 A00AA42 OOO Deutsche Bank
014 B00AA42 8-000000
014 A00AA43 PT. Deutsche Securities Indonesia
014 B00AA43 8-000000
014 A00AA44 PT. Deutsche Verdhana Indonesia
014 B00AA44 8-000000
014 A00AA45 Tilney Investment Management
014 B00AA45 8-000000
014 A00AA46 U.F.G.I.S. Trading Limited
014 B00AA46 8-000000
<PAGE>      PAGE  4
014 A00AA47 UFG (UK) Limited
014 B00AA47 8-000000
014 A00AA48 Yieldbroker Pty Ltd.
014 B00AA48 8-000000
014 A00AA49 ZAO United Financial Group
014 B00AA49 8-000000
014 A00AA50 DB STRATEGIC ADVISORS, INC.
014 B00AA50 8-000000
014 A00AA51 DEUTSCHE SECURITIES SAUDI ARABIA LLC
014 B00AA51 8-000000
014 A00AA52 HANOI BUILDING COMMERCIAL JOINT STOCK BANK
014 B00AA52 8-000000
014 A00AA53 BATS TRADING, INC.
014 B00AA53 8-0
014 A00AA54 Deutsche Bank SPEARs/LIFERs Tr, Ser DB-453
014 B00AA54 8-0
015 A00AA01 STATE STREET BANK & TRUST CO.
015 B00AA01 C
015 C01AA01 BOSTON
015 C02AA01 MA
015 C03AA01 02111
015 E01AA01 X
018  00AA00 Y
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019 B00AA00  128
019 C00AA00 DWSFUNDSSS
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022 A000001 CREDIT SUISSE
022 B000001 13-5659485
022 C000001  87422209
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022 A000002 CHASE SECURITIES INC.
022 B000002 13-3112953
022 C000002  73977215
022 D000002    229985
022 A000003 BNP PARIBAS
022 B000003 13-3235334
022 C000003  17926082
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022 A000004 MORGAN STANELY
022 B000004 13-2655985
022 C000004  14456889
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022 A000005 BARCLAYS CAPITAL, INC.
022 B000005 05-0346412
022 C000005   9290955
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022 A000006 BANK OF AMERICA CORP.
022 B000006 36-0947896
022 C000006   1078430
022 D000006    500000
<PAGE>      PAGE  5
022 A000007 DAIWA Securities LTD
022 C000007    719958
022 D000007     49763
022 A000008 GOLDMAN SACHS
022 B000008 15-5108880
022 C000008    585100
022 D000008         0
022 A000009 BANK OF NEW YORK
022 B000009 13-4941102
022 C000009    487008
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022 A000010 STATE STREET BANK & TRUST CO.
022 B000010 04-1867445
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023 C000000  206280714
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024  00AA00 Y
025 A00AA01 BARCLAYS CAPITAL
025 B00AA01 13-3297824
025 C00AA01 D
025 D00AA01  818000
025 A00AA02 The Goldman Sachs & Co., Inc.
025 C00AA02 D
025 D00AA02  400000
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<PAGE>      PAGE  9
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<PAGE>      PAGE  10
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<PAGE>      PAGE  11
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SIGNATURE   PAUL SCHUBERT
TITLE       TREASURER