PAGE 1 000 A000000 04/30/2013 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 CAPITAL MARKETS, LLC 014 B000001 8-67827 014 A000002 BLACKROCK EXECUTION SERVICES 014 B000002 8-48719 014 A000003 BLACKROCK INVESTMENTS, LLC 014 B000003 8-48436 014 A000004 HARRIS WILLIAMS LLC 014 B000004 8-53380 014 A000005 PNC CAPITAL MARKETS, INC. 014 B000005 8-32493 014 A000006 PNC INVESTMENTS, LLC 014 B000006 8-66195 015 A000001 THE BANK OF NEW YORK MELLON CORP. 015 B000001 C 015 C010001 NEW YORK 015 C020001 NY 015 C030001 10286 015 E010001 X 018 000000 Y 019 A000000 Y 019 B000000 290 019 C000000 BLKRKADVSR 020 A000001 RBC CAPITAL MARKETS CORP. 020 B000001 13-5033225 020 C000001 44 020 A000002 CITIGROUP GLOBAL MARKETS, INC. 020 B000002 11-2418191 020 C000002 43 020 A000003 MORGAN STANLEY 020 B000003 13-2655998 020 C000003 34 020 A000004 UBS SECURITIES 020 B000004 13-2932996 020 C000004 19 020 A000005 JP MORGAN CHASE & CO. 020 B000005 13-3379014 020 C000005 18 020 A000006 DEUTSCHE BANK SECURITIES INC. 020 B000006 13-2730828 020 C000006 15 020 A000007 GOLDMAN SACHS GROUP, INC. 020 B000007 13-5108880 020 C000007 14 020 A000008 CREDIT SUISSE FIRST BOSTON 020 B000008 13-1898818 020 C000008 12 020 A000009 BANK OF AMERICA SECURITIES LLC 020 B000009 56-2058405 020 C000009 12 020 A000010 TD SECURITIES (USA) LLC 020 B000010 20-1177269 PAGE 3 020 C000010 11 021 000000 271 022 A000001 CITIGROUP GLOBAL MARKETS INC. 022 B000001 11-2418191 022 C000001 34153 022 D000001 30917 022 A000002 MORGAN STANLEY & CO., INC. 022 B000002 13-2655998 022 C000002 46774 022 D000002 8111 022 A000003 UBS SECURITIES LLC 022 B000003 13-3873456 022 C000003 7801 022 D000003 43109 022 A000004 RBC CAPITAL MARKETS CORP. 022 B000004 13-5033225 022 C000004 33384 022 D000004 4629 022 A000005 GOLDMAN SACHS GROUP, INC. 022 B000005 13-5108880 022 C000005 20880 022 D000005 8447 022 A000006 CREDIT SUISSE FIRST BOSTON 022 B000006 13-1898818 022 C000006 20762 022 D000006 4161 022 A000007 JP MORGAN CHASE & CO. 022 B000007 13-3379014 022 C000007 14384 022 D000007 4369 022 A000008 DEUTSCHE BANK SECURITIES, INC. 022 B000008 13-2730828 022 C000008 13483 022 D000008 4279 022 A000009 SANFORD C. BERNSTEIN & CO. LLC 022 B000009 13-4132953 022 C000009 10985 022 D000009 5116 022 A000010 BARCLAYS CAPITAL, INC. 022 B000010 06-1031656 022 C000010 12171 022 D000010 2974 023 C000000 234401 023 D000000 148381 024 000000 N 026 A000000 N 026 B000000 Y 026 C000000 N 026 D000000 Y 026 E000000 N 026 F000000 N PAGE 4 026 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 0 042 D000000 0 042 E000000 0 042 F000000 0 042 G000000 0 042 H000000 0 PAGE 5 043 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 054 L000000 Y 054 M000000 N 054 N000000 N 054 O000000 Y 055 A000000 N PAGE 6 055 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 0.0 062 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 PAGE 7 070 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 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 235388 071 B000000 252316 071 C000000 335259 071 D000000 70 072 A000000 6 072 B000000 0 072 C000000 6651 072 D000000 0 072 E000000 0 072 F000000 1693 072 G000000 0 072 H000000 0 072 I000000 24 072 J000000 56 072 K000000 0 072 L000000 10 072 M000000 16 072 N000000 5 072 O000000 0 072 P000000 0 072 Q000000 0 072 R000000 33 072 S000000 33 072 T000000 0 072 U000000 0 072 V000000 0 072 W000000 9 PAGE 8 072 X000000 1879 072 Y000000 4 072 Z000000 4776 072AA000000 15855 072BB000000 7484 072CC010000 19749 072CC020000 0 072DD010000 12258 072DD020000 0 072EE000000 0 073 A010000 0.7300 073 A020000 0.0000 073 B000000 0.0000 073 C000000 0.0000 074 A000000 472 074 B000000 0 074 C000000 0 074 D000000 0 074 E000000 0 074 F000000 345808 074 G000000 0 074 H000000 0 074 I000000 12319 074 J000000 10233 074 K000000 1 074 L000000 1279 074 M000000 7 074 N000000 370119 074 O000000 1744 074 P000000 294 074 Q000000 0 074 R010000 0 074 R020000 0 074 R030000 5301 074 R040000 203 074 S000000 0 074 T000000 362577 074 U010000 16907 074 U020000 0 074 V010000 21.45 074 V020000 0.00 074 W000000 0.0000 074 X000000 12302 074 Y000000 30 075 A000000 0 075 B000000 336189 076 000000 19.80 077 A000000 N 078 000000 N 080 C000000 0 081 B000000 0 PAGE 9 082 B000000 0 083 B000000 0 084 B000000 0 086 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