<PAGE> PAGE 1
000 A000000 02/29/2000
000 C000000 0001068202
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 6.1
000 J000000 A
001 A000000 STEIN ROE ADVISOR FLOATING RATE INCOME FUND
001 B000000 811-08955
001 C000000 3123683274
002 A000000 ONE SOUTH WACKER DRIVE
002 B000000 CHICAGO
002 C000000 IL
002 D010000 60606
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 COLONIAL MANAGEMENT ASSOCIATES
008 B000001 A
008 C000001 801-2019
008 D010001 BOSTON
008 D020001 MA
008 D030001 02111
010 A000001 COLONIAL MANAGEMENT ASSOCIATES, INC.
010 B000001 8-72176
010 C010001 BOSOTN
010 C020001 MA
010 C030001 02111
011 A000001 COLONIAL MANAGEMENT ASSOCIATES INC.
011 B000001 8-42176
011 C010001 BOSTON
011 C020001 MA
011 C030001 02111
012 A000001 COLONIAL INVESTOR SERVICES CENTER, INC.
012 B000001 84-1329
012 C010001 BOSTON
<PAGE> PAGE 2
012 C020001 MA
012 C030001 02111
013 A000001 PRICEWATERHOUSECOOPERS
013 B010001 BOSTON
013 B020001 MA
013 B030001 02110
024 000000 N
027 000000 Y
028 A010000 0
028 A020000 4
028 A030000 0
028 A040000 10
028 B010000 12
028 B020000 4
028 B030000 0
028 B040000 0
028 C010000 4258
028 C020000 3
028 C030000 0
028 C040000 902
028 D010000 5894
028 D020000 3
028 D030000 0
028 D040000 0
028 E010000 19751
028 E020000 64
028 E030000 0
028 E040000 0
028 F010000 23298
028 F020000 152
028 F030000 0
028 F040000 0
028 G010000 53214
028 G020000 230
028 G030000 0
028 G040000 912
028 H000000 46894
029 000000 N
030 A000000 0
030 B000000 0.00
030 C000000 0.00
031 A000000 0
031 B000000 0
032 000000 0
033 000000 0
034 000000 N
035 000000 0
036 B000000 0
037 000000 N
038 000000 0
042 A000000 0
<PAGE> PAGE 3
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
055 A000000 N
055 B000000 N
056 000000 N
057 000000 N
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 15.9
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 83.6
062 R000000 0.5
063 A000000 0
063 B000000 5.5
066 A000000 N
067 000000 N
068 A000000 N
068 B000000 N
069 000000 N
070 A010000 Y
070 A020000 Y
070 B010000 Y
070 B020000 N
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
<PAGE> PAGE 4
070 G020000 N
070 H010000 Y
070 H020000 N
070 I010000 Y
070 I020000 N
070 J010000 Y
070 J020000 N
070 K010000 Y
070 K020000 N
070 L010000 Y
070 L020000 N
070 M010000 Y
070 M020000 N
070 N010000 Y
070 N020000 N
070 O010000 Y
070 O020000 N
070 P010000 Y
070 P020000 N
070 Q010000 Y
070 Q020000 N
070 R010000 Y
070 R020000 N
071 A000000 86795
071 B000000 21849
071 C000000 137336
071 D000000 16
072 A000000 6
072 B000000 499
072 C000000 0
072 D000000 0
072 E000000 0
072 F000000 27
072 G000000 11
072 H000000 0
072 I000000 9
072 J000000 20
072 K000000 0
072 L000000 0
072 M000000 5
072 N000000 0
072 O000000 0
072 P000000 0
072 Q000000 13
072 R000000 13
072 S000000 0
072 T000000 33
072 U000000 0
072 V000000 0
072 W000000 0
072 X000000 131
<PAGE> PAGE 5
072 Y000000 52
072 Z000000 420
072AA000000 72
072BB000000 0
072CC010000 0
072CC020000 45
072DD010000 420
072DD020000 0
072EE000000 0
073 A010000 0.2690
073 A020000 0.2450
073 B000000 0.0000
073 C000000 0.0000
074 A000000 0
074 B000000 0
074 C000000 0
074 D000000 48830
074 E000000 0
074 F000000 0
074 G000000 0
074 H000000 0
074 I000000 0
074 J000000 0
074 K000000 14
074 L000000 0
074 M000000 4704
074 N000000 53548
074 O000000 0
074 P000000 0
074 Q000000 0
074 R010000 0
074 R020000 0
074 R030000 0
074 R040000 94
074 S000000 0
074 T000000 53454
074 U010000 1587
074 U020000 1725
074 V010000 0.00
074 V020000 0.00
074 W000000 0.0000
074 X000000 0
074 Y000000 0
075 A000000 0
075 B000000 11419
076 000000 0.00
077 A000000 N
SIGNATURE GAIL KNUDSEN
TITLE VICE PRESIDENT
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0001068200
<NAME> SRF Base Trust
<SERIES>
<NUMBER> 0
<NAME> SR Advisor Floating Rate Income Fund Class A
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> AUG-31-2000
<PERIOD-START> SEP-01-1999
<PERIOD-END> FEB-29-2000
<INVESTMENTS-AT-COST> 0
<INVESTMENTS-AT-VALUE> 48830
<RECEIVABLES> 0
<ASSETS-OTHER> 4718
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 53548
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 94
<TOTAL-LIABILITIES> 94
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 53424
<SHARES-COMMON-STOCK> 1587
<SHARES-COMMON-PRIOR> 0
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 72
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (44)
<NET-ASSETS> 53452
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 499
<OTHER-INCOME> 0
<EXPENSES-NET> 79
<NET-INVESTMENT-INCOME> 420
<REALIZED-GAINS-CURRENT> 72
<APPREC-INCREASE-CURRENT> (405)
<NET-CHANGE-FROM-OPS> 31
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (98)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1580
<NUMBER-OF-SHARES-REDEEMED> 0
<SHARES-REINVESTED> 7
<NET-CHANGE-IN-ASSETS> 52559
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR>0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 27
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 131
<AVERAGE-NET-ASSETS> 2599
<PER-SHARE-NAV-BEGIN> 10.050
<PER-SHARE-NII> 0.269
<PER-SHARE-GAIN-APPREC> (0.010)
<PER-SHARE-DIVIDEND> (0.269)
<PER-SHARE-DISTRIBUTIONS>0
<RETURNS-OF-CAPITAL> 0.000
<PER-SHARE-NAV-END> 10.040
<EXPENSE-RATIO> 1.150
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0001068200
<NAME> SRF Base Trust
<SERIES>
<NUMBER> 0
<NAME> SR Advisor Floating Rate Income Fund Class B
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> AUG-31-2000
<PERIOD-START> SEP-01-1999
<PERIOD-END> FEB-29-2000
<INVESTMENTS-AT-COST> 0
<INVESTMENTS-AT-VALUE> 48830
<RECEIVABLES> 0
<ASSETS-OTHER> 4718
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 53548
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 94
<TOTAL-LIABILITIES> 94
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 53424
<SHARES-COMMON-STOCK> 1725
<SHARES-COMMON-PRIOR> 0
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 72
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (44)
<NET-ASSETS> 53452
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 499
<OTHER-INCOME> 0
<EXPENSES-NET> 79
<NET-INVESTMENT-INCOME> 420
<REALIZED-GAINS-CURRENT> 72
<APPREC-INCREASE-CURRENT> (45)
<NET-CHANGE-FROM-OPS> 31
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (152)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1717
<NUMBER-OF-SHARES-REDEEMED> 0
<SHARES-REINVESTED> 8
<NET-CHANGE-IN-ASSETS> 52559
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR>0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 27
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 131
<AVERAGE-NET-ASSETS> 4099
<PER-SHARE-NAV-BEGIN> 10.050
<PER-SHARE-NII> 0.245
<PER-SHARE-GAIN-APPREC> (0.010)
<PER-SHARE-DIVIDEND> (0.245)
<PER-SHARE-DISTRIBUTIONS>0
<RETURNS-OF-CAPITAL> 0.000
<PER-SHARE-NAV-END> 10.040
<EXPENSE-RATIO> 1.500
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0001068200
<NAME> SRF Base Trust
<SERIES>
<NUMBER> 0
<NAME> SR Advisor Floating Rate Income Fund Class C
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> AUG-31-2000
<PERIOD-START> SEP-01-1999
<PERIOD-END> FEB-29-2000
<INVESTMENTS-AT-COST>0
<INVESTMENTS-AT-VALUE> 48830
<RECEIVABLES> 0
<ASSETS-OTHER> 4718
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 53548
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 94
<TOTAL-LIABILITIES> 94
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 53424
<SHARES-COMMON-STOCK> 1488
<SHARES-COMMON-PRIOR> 0
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 72
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (44)
<NET-ASSETS> 53452
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 499
<OTHER-INCOME> 0
<EXPENSES-NET> 79
<NET-INVESTMENT-INCOME> 420
<REALIZED-GAINS-CURRENT> 72
<APPREC-INCREASE-CURRENT> (45)
<NET-CHANGE-FROM-OPS> 31
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (126)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1482
<NUMBER-OF-SHARES-REDEEMED> 0
<SHARES-REINVESTED> 6
<NET-CHANGE-IN-ASSETS> 52559
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 27
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 131
<AVERAGE-NET-ASSETS> 3531
<PER-SHARE-NAV-BEGIN> 10.050
<PER-SHARE-NII> 0.239
<PER-SHARE-GAIN-APPREC> (0.010)
<PER-SHARE-DIVIDEND> (0.239)
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0.000
<PER-SHARE-NAV-END> 10.040
<EXPENSE-RATIO> 1.700
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0001068200
<NAME> Stein Roe Floating Rate Income Fund
<SERIES>
<NUMBER> 0
<NAME> SR Advisor Floating Rate Income Fund Class Z
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> AUG-31-2000
<PERIOD-START> SEP-01-1999
<PERIOD-END> FEB-29-2000
<INVESTMENTS-AT-COST> 0
<INVESTMENTS-AT-VALUE> 48830
<RECEIVABLES> 0
<ASSETS-OTHER> 4718
<OTHER-ITEMS-ASSETS> 0
<TOTAL-ASSETS> 53548
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 94
<TOTAL-LIABILITIES> 94
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 53424
<SHARES-COMMON-STOCK> 526
<SHARES-COMMON-PRIOR> 0
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 72
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (44)
<NET-ASSETS> 53452
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 499
<OTHER-INCOME> 0
<EXPENSES-NET> 79
<NET-INVESTMENT-INCOME> 420
<REALIZED-GAINS-CURRENT> 72
<APPREC-INCREASE-CURRENT> (45)
<NET-CHANGE-FROM-OPS> 31
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (44)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 524
<NUMBER-OF-SHARES-REDEEMED> 0
<SHARES-REINVESTED> 1
<NET-CHANGE-IN-ASSETS> 52559
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 27
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 131
<AVERAGE-NET-ASSETS> 892
<PER-SHARE-NAV-BEGIN> 10.070
<PER-SHARE-NII> 0.407
<PER-SHARE-GAIN-APPREC> (0.030)
<PER-SHARE-DIVIDEND> (0.407)
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0.000
<PER-SHARE-NAV-END> 10.040
<EXPENSE-RATIO> 0.800
[AVG-DEBT-OUTSTANDING] 0
[AVG-DEBT-PER-SHARE] 0
</TABLE>
