PAGE  1
000 B000000 10/31/2013
000 C000000 0001528988
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 6.1
000 J000000 A
001 A000000 BLACKROCK UTILITY & INFRASTRUCTURE TRUST
001 B000000 811-22606
001 C000000 8008820052
002 A000000 100 BELLEVUE PARKWAY
002 B000000 WILMINGTON
002 C000000 DE
002 D010000 19809
003  000000 N
004  000000 N
005  000000 N
006  000000 N
007 A000000 N
007 B000000  0
007 C010100  1
008 A000001 BLACKROCK ADVISORS, LLC
008 B000001 A
008 C000001 801-47710
008 D010001 WILMINGTON
008 D020001 DE
008 D030001 19809
008 A000002 BLACKROCK FINANCIAL MANAGEMENT, INC.
008 B000002 S
008 C000002 801-48433
008 D010002 NEW YORK
008 D020002 NY
008 D030002 10055
008 A000003 BLACKROCK INVESTMENT MANAGEMENT, LLC
008 B000003 A
008 C000003 801-56972
008 D010003 PRINCETON
008 D020003 NJ
008 D030003 08540
012 A000001 COMPUTERSHARE TRUST COMPANY, N.A.
012 B000001 84-05925
012 C010001 CANTON
012 C020001 MA
012 C030001 02021
012 C040001 1011
013 A000001 DELOITTE & TOUCHE LLP
013 B010001 PHILADELPHIA
013 B020001 PA
013 B030001 19103
      PAGE  2
014 A000001 BLACKROCK EXECUTION SERVICES
014 B000001 8-48719
014 A000002 BLACKROCK INVESTMENTS, LLC
014 B000002 8-48436
014 A000003 HARRIS WILLIAMS LLC
014 B000003 8-53380
014 A000004 PNC CAPITAL MARKETS, INC.
014 B000004 8-32493
014 A000005 PNC INVESTMENTS, LLC
014 B000005 8-66195
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 Y
019 B000000  283
019 C000000 BLKRKADVSR
020 A000001 CITIGROUP GLOBAL MARKETS, INC.
020 B000001 11-2418191
020 C000001     71
020 A000002 MORGAN STANLEY
020 B000002 13-2655998
020 C000002     70
020 A000003 RBC CAPITAL MARKETS CORP.
020 B000003 13-5033225
020 C000003     54
020 A000004 UBS SECURITIES
020 B000004 13-2932996
020 C000004     46
020 A000005 DEUTSCHE BANK SECURITIES INC.
020 B000005 13-2730828
020 C000005     38
020 A000006 BANK OF AMERICA SECURITIES LLC
020 B000006 56-2058405
020 C000006     38
020 A000007 JP MORGAN CHASE & CO.
020 B000007 13-3379014
020 C000007     32
020 A000008 GOLDMAN SACHS GROUP, INC.
020 B000008 13-5108880
020 C000008     32
020 A000009 CREDIT SUISSE FIRST BOSTON
020 B000009 13-1898818
020 C000009     25
020 A000010 JEFFERIES & COMPANY, INC.
020 B000010 95-2622990
020 C000010     23
021  000000      534
      PAGE  3
022 A000001 CITIGROUP GLOBAL MARKETS INC.
022 B000001 11-2418191
022 C000001     49769
022 D000001     45276
022 A000002 MORGAN STANLEY & CO., INC.
022 B000002 13-2655998
022 C000002     75493
022 D000002     19462
022 A000003 UBS SECURITIES LLC
022 B000003 13-3873456
022 C000003     26950
022 D000003     62667
022 A000004 RBC CAPITAL MARKETS CORP.
022 B000004 13-5033225
022 C000004     56312
022 D000004      7548
022 A000005 GOLDMAN SACHS GROUP, INC.
022 B000005 13-5108880
022 C000005     29164
022 D000005     20195
022 A000006 DEUTSCHE BANK SECURITIES, INC.
022 B000006 13-2730828
022 C000006     36245
022 D000006     12611
022 A000007 CREDIT SUISSE FIRST BOSTON
022 B000007 13-1898818
022 C000007     39590
022 D000007      7226
022 A000008 BANC OF AMERICA SECURITIES LLC
022 B000008 56-2058405
022 C000008      9080
022 D000008     25726
022 A000009 JP MORGAN CHASE & CO.
022 B000009 13-3379014
022 C000009     20164
022 D000009     10273
022 A000010 BARCLAYS CAPITAL, INC.
022 B000010 06-1031656
022 C000010     23934
022 D000010      4244
023 C000000     427670
023 D000000     261750
024  000000 N
026 A000000 N
026 B000000 Y
026 C000000 N
026 D000000 Y
026 E000000 N
026 F000000 N
026 G010000 N
026 G020000 N
      PAGE  4
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
042 B000000   0
042 C000000   0
042 D000000   0
042 E000000   0
042 F000000   0
042 G000000   0
042 H000000   0
043  000000      0
044  000000      0
      PAGE  5
045  000000 Y
046  000000 N
047  000000 Y
048  000000  1.000
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 Y
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 Y
054 M000000 N
054 N000000 N
054 O000000 Y
055 A000000 Y
055 B000000 N
056  000000 Y
      PAGE  6
057  000000 N
058 A000000 N
059  000000 Y
060 A000000 N
060 B000000 N
061  000000        0
062 A000000 N
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   0.0
062 P000000   0.0
062 Q000000   0.0
062 R000000   0.0
063 A000000   0
063 B000000  0.0
066 A000000 Y
066 B000000 N
066 C000000 N
066 D000000 N
066 E000000 Y
066 F000000 N
066 G000000 N
067  000000 N
068 A000000 N
068 B000000 N
069  000000 N
070 A010000 Y
070 A020000 N
070 B010000 Y
070 B020000 Y
070 C010000 Y
070 C020000 N
070 D010000 Y
070 D020000 N
070 E010000 Y
070 E020000 N
070 F010000 Y
070 F020000 N
070 G010000 Y
070 G020000 N
      PAGE  7
070 H010000 Y
070 H020000 N
070 I010000 N
070 I020000 N
070 J010000 Y
070 J020000 N
070 K010000 Y
070 K020000 Y
070 L010000 Y
070 L020000 Y
070 M010000 Y
070 M020000 Y
070 N010000 Y
070 N020000 N
070 O010000 Y
070 O020000 N
070 P010000 Y
070 P020000 Y
070 Q010000 N
070 Q020000 N
070 R010000 N
070 R020000 N
071 A000000    441845
071 B000000    451194
071 C000000    332058
071 D000000  133
072 A000000 12
072 B000000        0
072 C000000    13354
072 D000000        0
072 E000000       49
072 F000000     3405
072 G000000        0
072 H000000        0
072 I000000       48
072 J000000      147
072 K000000        0
072 L000000       18
072 M000000       31
072 N000000        5
072 O000000        0
072 P000000        0
072 Q000000        0
072 R000000       66
072 S000000       18
072 T000000        0
072 U000000        0
072 V000000        0
072 W000000       33
072 X000000     3771
072 Y000000        8
      PAGE  8
072 Z000000     9640
072AA000000    27331
072BB000000    20913
072CC010000    17843
072CC020000        0
072DD010000    17341
072DD020000        0
072EE000000     7174
073 A010000   0.5200
073 A020000   0.0000
073 B000000   0.4200
073 C000000   0.5100
074 A000000     1496
074 B000000        0
074 C000000        0
074 D000000        0
074 E000000        0
074 F000000   343990
074 G000000        0
074 H000000        0
074 I000000    15720
074 J000000     2811
074 K000000        1
074 L000000     1164
074 M000000        2
074 N000000   365184
074 O000000     8398
074 P000000      294
074 Q000000        0
074 R010000        0
074 R020000        0
074 R030000     3993
074 R040000     1174
074 S000000        0
074 T000000   351325
074 U010000    16907
074 U020000        0
074 V010000    20.78
074 V020000     0.00
074 W000000   0.0000
074 X000000    20115
074 Y000000     8588
075 A000000        0
075 B000000   341195
076  000000    18.36
077 A000000 Y
077 B000000 Y
078  000000 N
080 A000000 Federal Insurance Company
080 B000000 National Union Fire Company
080 C000000    72025
      PAGE  9
081 A000000 Y
081 B000000  83
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
087 A020000 09248D104
087 A030000 BUI
088 A000000 N
088 B000000 N
088 C000000 N
088 D000000 N
SIGNATURE   ERIKA A. HEARN
TITLE       MANAGER