PAGE  1
000 B000000 12/31/2015
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
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
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
      PAGE  2
015 C010001 NEW YORK
015 C020001 NY
015 C030001 10286
015 E010001 X
018  000000 Y
019 A000000 Y
019 B000000  282
019 C000000 BLKRKADVSR
020 A000001 JEFFERIES & COMPANY, INC.
020 B000001 95-2622990
020 C000001     55
020 A000002 CITIGROUP GLOBAL MARKETS INC.
020 B000002 11-2418191
020 C000002     28
020 A000003 MORGAN STANLEY & CO., INC.
020 B000003 13-2655998
020 C000003     25
020 A000004 CREDIT SUISSE FIRST BOSTON
020 B000004 13-1898818
020 C000004     14
020 A000005 GOLDMAN, SACHS & CO
020 B000005 13-5108880
020 C000005      9
020 A000006 UBS SECURITIES LLC
020 B000006 13-3873456
020 C000006      9
020 A000007 MERRILL LYNCH, PIERCE, FENNER & SMITH, INC.
020 B000007 13-5674085
020 C000007      6
020 A000008 DEUTSCHE BANK SECURITIES INC.
020 B000008 13-2730828
020 C000008      6
020 A000009 SANFORD C. BERNSTEIN & CO. LLC
020 B000009 13-4132953
020 C000009      5
020 A000010 CONVERGEX EXECUTION SOLUTIONS LLC
020 B000010 13-3989198
020 C000010      5
021  000000      187
022 A000001 GOLDMAN, SACHS & CO
022 B000001 13-5108880
022 C000001     12677
022 D000001     17253
022 A000002 MORGAN STANLEY & CO., INC.
022 B000002 13-2655998
022 C000002      5813
022 D000002     10349
022 A000003 DEUTSCHE BANK SECURITIES INC.
022 B000003 13-2730828
022 C000003      9434
022 D000003      6582
      PAGE  3
022 A000004 UBS SECURITIES LLC
022 B000004 13-3873456
022 C000004      6367
022 D000004      6759
022 A000005 JEFFERIES & CO., INC.
022 B000005 95-2622900
022 C000005     10035
022 D000005      2936
022 A000006 CREDIT SUISSE FIRST BOSTON
022 B000006 13-1898818
022 C000006      7797
022 D000006      3202
022 A000007 BARCLAYS CAPITAL INC.
022 B000007 13-3297824
022 C000007      5490
022 D000007      2539
022 A000008 JP MORGAN CHASE & CO.
022 B000008 13-3379014
022 C000008      4564
022 D000008      3191
022 A000009 CITIGROUP GLOBAL MARKETS INC.
022 B000009 11-2418191
022 C000009      3959
022 D000009      3313
022 A000010 RBC CAPITAL MARKETS CORP.
022 B000010 41-1228350
022 C000010      2482
022 D000010      4581
023 C000000      74850
023 D000000      88091
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
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
      PAGE  4
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
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
      PAGE  5
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 N
055 B000000 N
056  000000 Y
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
      PAGE  6
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
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
      PAGE  7
070 N010000 Y
070 N020000 Y
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     68799
071 B000000     82823
071 C000000    346095
071 D000000   20
072 A000000 12
072 B000000        0
072 C000000    11847
072 D000000        0
072 E000000        6
072 F000000     3542
072 G000000        0
072 H000000        0
072 I000000       66
072 J000000      104
072 K000000        0
072 L000000       26
072 M000000       35
072 N000000        9
072 O000000        0
072 P000000        0
072 Q000000        0
072 R000000       74
072 S000000       23
072 T000000        0
072 U000000        0
072 V000000        0
072 W000000       65
072 X000000     3944
072 Y000000        8
072 Z000000     7917
072AA000000    23785
072BB000000    16685
072CC010000        0
072CC020000    40551
072DD010000    15446
072DD020000        0
072EE000000     9103
073 A010000   0.4200
073 A020000   0.0000
073 B000000   0.5400
073 C000000   0.4900
      PAGE  8
074 A000000       24
074 B000000        0
074 C000000        0
074 D000000        0
074 E000000        0
074 F000000   324026
074 G000000        0
074 H000000        0
074 I000000     8391
074 J000000       21
074 K000000        3
074 L000000      730
074 M000000        9
074 N000000   333204
074 O000000        0
074 P000000      282
074 Q000000        0
074 R010000        0
074 R020000        0
074 R030000     2892
074 R040000      283
074 S000000        0
074 T000000   329747
074 U010000    16907
074 U020000        0
074 V010000    19.50
074 V020000     0.00
074 W000000   0.0000
074 X000000    17043
074 Y000000     2977
075 A000000        0
075 B000000   354795
076  000000    16.78
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
      PAGE  9
077 Q030000 N
078  000000 N
080 A000000 Federal Insurance Company
080 B000000 St. Paul Fire & Marine Insurance Company
080 C000000    61025
081 A000000 Y
081 B000000  75
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   PETER KENNARD
TITLE       VICE PRESIDENT