MZF Managed Duration Investment Grade Municipal Fund (delisted)

000 B000000 07/31/2012
000 C000000 0001235511
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 6.1
000 J000000 A
001 A000000 MANAGED DURATION INVEST. GRADE MUNICIPAL FUND
001 B000000 811-21359
001 C000000 6305053700
002 A000000 2455 CORPORATE WEST DRIVE
002 B000000 LISLE
002 C000000 IL
002 D010000 60532
003 000000 N
004 000000 N
005 000000 N
006 000000 N
007 A000000 N
007 B000000 0
007 C010100 1
007 C010200 2
007 C010300 3
007 C010400 4
007 C010500 5
007 C010600 6
007 C010700 7
007 C010800 8
007 C010900 9
007 C011000 10
008 A000001 CUTWATER INVESTOR SERVICES CORP.
008 B000001 A
008 C000001 801-46649
008 D010001 ARMONK
008 D020001 NY
008 D030001 10504
010 A000001 GUGGENHEIM FUNDS INVESTMENT ADVISORS LLC
010 B000001 801-000000
010 C010001 LISLE
010 C020001 IL
010 C030001 60532
011 A000001 A.G. EDWARDS & SON, INC.
011 B000001 8-00000000
011 C010001 ST. LOUIS
011 C020001 MO
011 C030001 63103
012 A000001 COMPUTERSHARE SHAREOWNERS SERVICES LLC
012 B000001 84-0000000
012 C010001 PITTSBURGH

012 C020001 PA
012 C030001 15252
012 C040001 8015
012 A000002 GUGGENHEIM FUNDS DISTRIBUTORS, INC.
012 B000002 84-0000000
012 C010002 LISLE
012 C020002 IL
012 C030002 60532
013 A000001 ERNST & YOUNG LLP
013 B010001 CHICAGO
013 B020001 IL
013 B030001 60606
014 A000001 CUTWATER ASSET MANAGEMENT CORP.
014 B000001 8-47662
015 A000001 THE BANK OF NEW YORK MELLON
015 B000001 C
015 C010001 NEW YORK
015 C020001 NY
015 C030001 10286
015 E010001 X
018 000000 Y
019 A000000 N
019 B000000 0
020 C000001 0
020 C000002 0
020 C000003 0
020 C000004 0
020 C000005 0
020 C000006 0
020 C000007 0
020 C000008 0
020 C000009 0
020 C000010 0
021 000000 0
022 A000001 SMITH BARNEY HOLDINGS INC.
022 B000001 13-1912900
022 C000001 3843
022 D000001 5387
022 A000002 MORGAN STANLEY & CO. INC.
022 B000002 36-3145972
022 C000002 6219
022 D000002 723
022 A000003 CITIGROUP GLOBAL MARKETS INC.
022 B000003 13-2518466
022 C000003 2660
022 D000003 1811
022 A000004 RBC DAIN RUASCHER
022 B000004 41-1228350
022 C000004 1038
022 D000004 2060
022 A000005 MERRILL LYNCH & COMPANY INC.

022 B000005 13-2740599
022 C000005 2236
022 D000005 344
022 A000006 JP MORGAN SECURITIES INC
022 B000006 UNKNOWN
022 C000006 2140
022 D000006 0
022 A000007 GOLDMAN SACHS & COMPANY
022 B000007 13-5108880
022 C000007 2074
022 D000007 0
022 A000008 WACHOVIA SECURITIES, INC.
022 B000008 56-0898180
022 C000008 0
022 D000008 1601
022 A000009 FLEMING
022 B000009 UNKNOWN
022 C000009 1500
022 D000009 0
022 A000010 JEFFERIES & COMPANY INC
022 B000010 95-2622900
022 C000010 1492
022 D000010 0
023 C000000 52567
023 D000000 43595
024 000000 N
025 D000001 0
025 D000002 0
025 D000003 0
025 D000004 0
025 D000005 0
025 D000006 0
025 D000007 0
025 D000008 0
026 A000000 N
026 B000000 Y
026 C000000 N
026 D000000 Y
026 E000000 N
026 F000000 N
026 G010000 N
026 G020000 N
026 H000000 N
027 000000 N
028 A010000 0
028 A020000 0
028 A030000 0
028 A040000 0
028 B010000 0
028 B020000 0
028 B030000 0

028 B040000 0
028 C010000 0
028 C020000 0
028 C030000 0
028 C040000 0
028 D010000 0
028 D020000 0
028 D030000 0
028 D040000 0
028 E010000 0
028 E020000 0
028 E030000 0
028 E040000 0
028 F010000 0
028 F020000 0
028 F030000 0
028 F040000 0
028 G010000 0
028 G020000 0
028 G030000 0
028 G040000 0
028 H000000 0
030 A000000 0
030 B000000 0.00
030 C000000 0.00
031 A000000 0
031 B000000 0
032 000000 0
033 000000 0
035 000000 0
036 B000000 0
038 000000 0
042 A000000 0
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045 000000 Y
046 000000 N
047 000000 Y
048 000000 0.390
048 A010000 0
048 A020000 0.000
048 B010000 0
048 B020000 0.000
048 C010000 0

048 C020000 0.000
048 D010000 0
048 D020000 0.000
048 E010000 0
048 E020000 0.000
048 F010000 0
048 F020000 0.000
048 G010000 0
048 G020000 0.000
048 H010000 0
048 H020000 0.000
048 I010000 0
048 I020000 0.000
048 J010000 0
048 J020000 0.000
048 K010000 0
048 K020000 0.000
049 000000 N
050 000000 N
051 000000 N
052 000000 N
053 A000000 Y
053 B000000 Y
053 C000000 N
054 A000000 Y
054 B000000 Y
054 C000000 N
054 D000000 N
054 E000000 N
054 F000000 N
054 G000000 N
054 H000000 Y
054 I000000 N
054 J000000 Y
054 K000000 N
054 L000000 N
054 M000000 Y
054 N000000 N
054 O000000 N
055 A000000 Y
055 B000000 N
056 000000 Y
057 000000 N
058 A000000 N
059 000000 Y
060 A000000 Y
060 B000000 Y
061 000000 0
062 A000000 Y
062 B000000 0.0
062 C000000 0.0

062 D000000 0.0
062 E000000 0.0
062 F000000 0.0
062 G000000 0.0
062 H000000 0.0
062 I000000 0.0
062 J000000 0.0
062 K000000 0.0
062 L000000 0.0
062 M000000 0.0
062 N000000 0.0
062 O000000 163.4
062 P000000 0.0
062 Q000000 0.0
062 R000000 3.8
063 A000000 0
063 B000000 17.6
064 A000000 Y
064 B000000 N
066 A000000 N
067 000000 N
068 A000000 N
068 B000000 N
069 000000 N
070 A010000 Y
070 A020000 N
070 B010000 N
070 B020000 N
070 C010000 Y
070 C020000 N
070 D010000 N
070 D020000 N
070 E010000 Y
070 E020000 N
070 F010000 N
070 F020000 N
070 G010000 Y
070 G020000 N
070 H010000 N
070 H020000 N
070 I010000 N
070 I020000 N
070 J010000 Y
070 J020000 Y
070 K010000 Y
070 K020000 Y
070 L010000 N
070 L020000 N
070 M010000 N
070 M020000 N
070 N010000 N

070 N020000 N
070 O010000 N
070 O020000 N
070 P010000 Y
070 P020000 N
070 Q010000 N
070 Q020000 N
070 R010000 N
070 R020000 N
071 A000000 25193
071 B000000 24432
071 C000000 167919
071 D000000 15
072 A000000 12
072 B000000 8741
072 C000000 0
072 D000000 0
072 E000000 0
072 F000000 661
072 G000000 47
072 H000000 0
072 I000000 441
072 J000000 24
072 K000000 0
072 L000000 33
072 M000000 45
072 N000000 21
072 O000000 0
072 P000000 0
072 Q000000 65
072 R000000 33
072 S000000 63
072 T000000 0
072 U000000 0
072 V000000 0
072 W000000 185
072 X000000 1618
072 Y000000 254
072 Z000000 7377
072AA000000 0
072BB000000 240
072CC010000 9968
072CC020000 0
072DD010000 6709
072DD020000 0
072EE000000 0
073 A010000 0.9900
073 A020000 0.0000
073 B000000 0.0000
073 C000000 0.0000
074 A000000 27

074 B000000 0
074 C000000 1859
074 D000000 170944
074 E000000 2129
074 F000000 0
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074 H000000 0
074 I000000 0
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074 K000000 0
074 L000000 1890
074 M000000 16
074 N000000 176865
074 O000000 2580
074 P000000 77
074 Q000000 0
074 R010000 0
074 R020000 0
074 R030000 0
074 R040000 136
074 S000000 69450
074 T000000 104622
074 U010000 6787
074 U020000 0
074 V010000 15.41
074 V020000 0.00
074 W000000 0.0000
074 X000000 2565
074 Y000000 0
075 A000000 0
075 B000000 99993
076 000000 16.21
077 A000000 Y
077 B000000 Y
077 C000000 N
077 D000000 N
077 E000000 N
077 F000000 N
077 G000000 N
077 H000000 N
077 I000000 N
077 J000000 N
077 K000000 N
077 L000000 N
077 M000000 N
077 N000000 N
077 O000000 N
077 P000000 N
077 Q010000 N
077 Q020000 N
077 Q030000 N

078 000000 N
080 A000000 ICI MUTUAL INSURANCE COMPANY
080 C000000 5725
081 A000000 Y
081 B000000 8
082 A000000 N
082 B000000 0
083 A000000 N
083 B000000 0
084 A000000 N
084 B000000 0
085 A000000 Y
085 B000000 N
086 A010000 0
086 A020000 0
086 B010000 0
086 B020000 0
086 C010000 0
086 C020000 0
086 D010000 0
086 D020000 0
086 E010000 0
086 E020000 0
086 F010000 0
086 F020000 0
087 A010000 COMMON SHARES
087 A020000 56165R103
087 A030000 MZF
088 A000000 N
088 B000000 N
088 C000000 N
088 D000000 Y
SIGNATURE JOHN SULLIVAN
TITLE CFO & TREASURER