PAGE  1
000 A000000 06/30/2017
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 and 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 INTERNATIONAL LTD.
008 B000002 S
008 C000002 801-51087
008 D010002 EDINBURGH
008 D050002 UNITED KINGDOM
008 D060002 EH3 8BL
012 A000001 COMPUTERSHARE TRUST COMPANY, N.A.
012 B000001 85-11340
012 C010001 CANTON
012 C020001 MA
012 C030001 02021
013 A000001 DELOITTE & TOUCHE L.L.P.
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.
      PAGE  2
014 B000004 8-32493
014 A000005 PNC INVESTMENTS LLC
014 B000005 8-66195
014 A000006 SOLEBURY CAPITAL, LLC
014 B000006 8-67548
015 A000001 STATE STREET BANK &  TRUST COMPANY
015 B000001 C
015 C010001 BOSTON
015 C020001 MA
015 C030001 02111
015 E010001 X
015 A000002 UNICREDIT BANK AUSTRIA
015 B000002 S
015 C010002 VIENNA
015 D010002 AUSTRIA
015 D020002 A-1090
015 E040002 X
015 A000003 HSBC AUSTRALIA
015 B000003 S
015 C010003 SYDNEY
015 D010003 AUSTRALIA
015 D020003 NSW2000
015 E040003 X
015 A000004 DEUTSCHE BANK BELGIUM
015 B000004 S
015 C010004 BRUSSELS
015 D010004 BELGIUM
015 D020004 1101 HE
015 E040004 X
015 A000005 CITIBANK N.A.
015 B000005 S
015 C010005 Sao Paulo
015 D010005 BRAZIL
015 D020005 01311-20
015 E040005 X
015 A000006 STATE STREET TRUST CO CDA CDSX
015 B000006 S
015 C010006 TORONTO
015 D010006 CANADA
015 E040006 X
015 A000007 STATE STREET TR CO CDA RBCPHYS
015 B000007 S
015 C010007 TORONTO
015 D010007 CANADA
015 E040007 X
015 A000008 CREDIT SUISSE, ZURICH
015 B000008 S
015 C010008 Zurich
015 D010008 Switzerland
015 D020008 8070
015 E040008 X
      PAGE  3
015 A000009 THE HONGKONG + SHANGHAI BANKING COR
015 B000009 S
015 C010009 Shanghai
015 D010009 China
015 E040009 X
015 A000010 SSB GMBH GERMANY - CBF
015 B000010 S
015 C010010 FRANKFURT
015 D010010 GERMANY
015 E040010 X
015 A000011 SKANDINAVISKA ENSKILDA BANKEN
015 B000011 S
015 C010011 COPENHAGEN
015 D010011 DENMARK
015 D020011 1577
015 E040011 X
015 A000012 DEUTSCHE BANK SPAIN
015 B000012 S
015 C010012 MADRID
015 D010012 SPAIN
015 E040012 X
015 A000013 EUROCLEAR, London
015 B000013 S
015 C010013 London
015 D010013 Great Britain
015 E040013 X
015 A000014 SEB FINLAND
015 B000014 S
015 C010014 HELSINKI
015 D010014 FINLAND
015 E040014 X
015 A000015 DEUTSCHE BANK PARIS
015 B000015 S
015 C010015 PARIS
015 D010015 FRANCE
015 E040015 X
015 A000016 STATE STREET BK LONDON-CREST
015 B000016 S
015 C010016 LONDON
015 D010016 UNITED KINGDOM
015 E040016 X
015 A000017 STATE STREET BK LDN - PHYSICAL
015 B000017 S
015 C010017 LONDON
015 D010017 UNITED KINGDOM
015 E040017 X
015 A000018 BNP PARIBAS GREECE
015 B000018 S
015 C010018 Athens
015 D010018 GREECE
015 D020018 115 28
      PAGE  4
015 E040018 X
015 A000019 STANDARD CHARTERED BANK
015 B000019 S
015 C010019 HONG KONG
015 D010019 HONG KONG
015 E040019 X
015 A000020 BANK HAPOALIM BM
015 B000020 S
015 C010020 TEL AVIV
015 D010020 ISRAEL
015 D020020 61000
015 E040020 X
015 A000021 DEUTSCHE BANK
015 B000021 S
015 C010021 MILAN
015 D010021 ITALY
015 D020021 20124
015 E040021 X
015 A000022 MIZUHO BANK, LTD
015 B000022 S
015 C010022 TOKYO
015 D010022 JAPAN
015 E040022 X
015 A000023 DEUTSCHE BANK N.V.
015 B000023 S
015 C010023 AMSTERDAM
015 D010023 NETHERLANDS
015 E040023 X
015 A000024 SEB NORWAY
015 B000024 S
015 C010024 OSLO
015 D010024 NORWAY
015 D020024 NO-0123
015 E040024 X
015 A000025 DEUTSCHE BANK PORTUGAL
015 B000025 S
015 C010025 LISBON
015 D010025 PORTUGAL
015 E040025 X
015 A000026 SKANDINAVISK ENSKILDA BANKEN
015 B000026 S
015 C010026 STOCKHOLM
015 D010026 SWEDEN
015 D020026 SE-106 40
015 E040026 X
015 A000027 CITIBANK SINGAPORE
015 B000027 S
015 C010027 SINGAPORE
015 D010027 SINGAPORE
015 D020027 486026
015 E040027 X
      PAGE  5
015 A000028 STANDARD CHARTERED BANK
015 B000028 S
015 C010028 TAIPEI
015 D010028 TAIWAN
015 E040028 X
018  000000 Y
019 A000000 Y
019 B000000  273
019 C000000 BLKRKADVSR
020 A000001 MORGAN STANLEY & CO INC
020 B000001 13-2655998
020 C000001     10
020 A000002 COWEN & COMPANY, LLC
020 B000002 38-3698933
020 C000002      6
020 A000003 KEPLER CAPITAL MARKETS, INC.
020 B000003 20-3639425
020 C000003      4
020 A000004 JEFFERIES & COMPANY INC
020 B000004 95-2622900
020 C000004      4
020 A000005 CITIGROUP GLOBAL MARKETS INC.
020 B000005 11-2418191
020 C000005      3
020 A000006 CLSA AMERICAS, LLC
020 B000006 46-0882815
020 C000006      2
020 A000007 INSTINET LLC
020 B000007 13-2625132
020 C000007      2
020 A000008 GOLDMAN SACHS & CO
020 B000008 13-5108880
020 C000008      1
020 A000009 JP MORGAN CLEARING CORP
020 B000009 13-3604093
020 C000009      1
020 A000010 PAREL
020 C000010      1
021  000000       39
022 A000001 BLK LIQUIDITY FUNDS, T-FUND, INST. CLASS
022 B000001 52-0983343
022 C000001     18530
022 D000001     19141
022 A000002 DEUTSCHE BANK SECURITIES, INC.
022 B000002 13-2730828
022 C000002      5746
022 D000002         0
023 C000000      24276
023 D000000      19141
024  000000 N
026 A000000 N
      PAGE  6
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
042 B000000   0
042 C000000   0
      PAGE  7
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
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
      PAGE  8
054 L000000 Y
054 M000000 N
054 N000000 N
054 O000000 Y
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 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
      PAGE  9
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 N
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     47376
071 B000000     59977
071 C000000    342439
071 D000000   14
072 A000000  6
072 B000000        0
072 C000000     7082
072 D000000        0
072 E000000        4
072 F000000     1703
072 G000000        0
072 H000000        0
072 I000000       31
072 J000000       61
072 K000000        0
072 L000000        9
072 M000000       16
072 N000000        4
072 O000000        0
072 P000000        0
072 Q000000        0
072 R000000       37
      PAGE  10
072 S000000       10
072 T000000        0
072 U000000        0
072 V000000        0
072 W000000       35
072 X000000     1906
072 Y000000        1
072 Z000000     5181
072AA000000     5140
072BB000000        0
072CC010000    23736
072CC020000        0
072DD010000    12277
072DD020000        0
072EE000000        0
073 A010000   0.7260
073 A020000   0.0000
073 B000000   0.0000
073 C000000   0.0000
074 A000000        8
074 B000000        0
074 C000000        0
074 D000000        0
074 E000000        0
074 F000000   348454
074 G000000       83
074 H000000        0
074 I000000     3540
074 J000000        0
074 K000000        2
074 L000000      656
074 M000000       14
074 N000000   352757
074 O000000        0
074 P000000      292
074 Q000000        0
074 R010000        0
074 R020000        0
074 R030000     1673
074 R040000      428
074 S000000        0
074 T000000   350364
074 U010000    16921
074 U020000        0
074 V010000    20.71
074 V020000     0.00
074 W000000   0.0000
074 X000000    17271
074 Y000000     1685
075 A000000        0
075 B000000   343457
      PAGE  11
076  000000    20.55
077 A000000 N
078  000000 N
080 C000000        0
081 B000000   0
082 B000000        0
083 B000000        0
084 B000000        0
086 A010000      0
086 A020000      0
086 B010000     14
086 B020000    288
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   NEAL J. ANDREWS
TITLE       CFO