N-CSRS/A

                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                   FORM N-CSR

                   CERTIFIED SHAREHOLDER REPORT OF REGISTERED
                         MANAGEMENT INVESTMENT COMPANIES


Investment Company Act file number: 811-05757

                      BlackRock Preferred Opportunity Trust
- --------------------------------------------------------------------------------
               (Exact name of registrant as specified in charter)

          100 Bellevue Parkway, Wilmington, DE                        19809
- --------------------------------------------------------------------------------
         (Address of principal executive offices)                   (Zip code)

                           Robert S. Kapito, President
                      BlackRock Preferred Opportunity Trust
                    40 East 52nd Street, New York, NY 10022
- --------------------------------------------------------------------------------
                     (Name and address of agent for service)


Registrant's telephone number, including area code: (302) 797-2449

Date of fiscal year end: 12/31/03

Date of reporting period: 6/30/03



                                EXPLANATORY NOTE

This amendment on Form N-CSRS/A is filed in order to correct the dates on the
signatures page and on the certifications to the Form N-CSRS which filed on
August 28, 2003. No changes were made to the report, which is hereby
incorporated by reference.



                                   SIGNATURES

         Pursuant to the requirements of the Securities Exchange Act of 1934 and
the Investment Company Act of 1940, the registrant has duly caused this report
to be signed on its behalf by the undersigned, thereunto duly authorized.

(Registrant) BlackRock Preferred Opportunity Trust

By:      /s/ Henry Gabbay
         ---------------------------
Name:    Henry Gabbay
Title:   Treasurer
Date:    8/27/03

         Pursuant to the requirements of the Securities Exchange Act of 1934 and
the Investment Company Act of 1940, this report has been signed by the following
persons on behalf of the registrant and in the capacities and on the dates
indicated.

By:      /s/ Robert S. Kapito
         ---------------------------
Name:    Robert S. Kapito
Title:   Principal Executive Officer
Date:    8/27/03

By:      /s/ Henry Gabbay
         ---------------------------
Name:    Henry Gabbay
Title:   Principal Financial Officer
Date:    8/27/03

EX-99.CERT

                                                                 Exhibit 99.Cert



I, Robert Kapito, certify that:

1. I have reviewed this report on Form N-CSR of BlackRock Preferred Opportunity
Trust;

2. Based on my knowledge, this report does not contain any untrue statement of a
material fact or omit to state a material fact necessary to make the statements
made, in light of the circumstances under which such statements were made, not
misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial
information included in this report, fairly present in all material respects the
financial condition, results of operations, changes in net assets, and cash
flows (if the financial statements are required to include a statement of cash
flows) of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officer(s) and I are responsible for
establishing and maintaining disclosure controls and procedures (as defined in
Rule 30a-3(c) under the Investment Company Act of 1940) for the registrant and
have:

(a) Designed such disclosure controls and procedures, or caused such disclosure
controls and procedures to be designed under our supervision, to ensure that
material information relating to the registrant, including its consolidated
subsidiaries, is made known to us by others within those entities, particularly
during the period in which this report is being prepared;

(b) Evaluated the effectiveness of the registrant's disclosure controls and
procedures and presented in this report our conclusions about the effectiveness
of the disclosure controls and procedures, as of a date within 90 days prior to
the filing date of this report based on such evaluation; and

(c) Disclosed in this report any change in the registrant's internal control
over financial reporting that occurred during the registrant's most recent
fiscal half-year (the registrant's second fiscal half-year in the case of an
annual report) that has materially affected, or is reasonably likely to
materially affect, the registrant's internal control over financial reporting;
and

5. The registrant's other certifying officer(s) and I have disclosed to the
registrant's auditors and the audit committee of the registrant's board of
directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or
operation of internal control over financial reporting which are reasonably
likely to adversely affect the registrant's ability to record, process,
summarize, and report financial information; and

(b) Any fraud, whether or not material, that involves management or other
employees who have a significant role in the registrant's internal control over
financial reporting.

Date: 8/27/03
      --------

                                    /s/ Robert Kapito
                                    --------------------------
                                    Robert Kapito
                                    Principal Executive Officer




                                                                 Exhibit 99.Cert



I, Henry Gabbay, certify that:

1. I have reviewed this report on Form N-CSR of BlackRock Preferred Opportunity
Trust;

2. Based on my knowledge, this report does not contain any untrue statement of a
material fact or omit to state a material fact necessary to make the statements
made, in light of the circumstances under which such statements were made, not
misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial
information included in this report, fairly present in all material respects the
financial condition, results of operations, changes in net assets, and cash
flows (if the financial statements are required to include a statement of cash
flows) of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officer(s) and I are responsible for
establishing and maintaining disclosure controls and procedures (as defined in
Rule 30a-3(c) under the Investment Company Act of 1940) for the registrant and
have:

(a) Designed such disclosure controls and procedures, or caused such disclosure
controls and procedures to be designed under our supervision, to ensure that
material information relating to the registrant, including its consolidated
subsidiaries, is made known to us by others within those entities, particularly
during the period in which this report is being prepared;

(b) Evaluated the effectiveness of the registrant's disclosure controls and
procedures and presented in this report our conclusions about the effectiveness
of the disclosure controls and procedures, as of a date within 90 days prior to
the filing date of this report based on such evaluation; and

(c) Disclosed in this report any change in the registrant's internal control
over financial reporting that occurred during the registrant's most recent
fiscal half-year (the registrant's second fiscal half-year in the case of an
annual report) that has materially affected, or is reasonably likely to
materially affect, the registrant's internal control over financial reporting;
and

5. The registrant's other certifying officer(s) and I have disclosed to the
registrant's auditors and the audit committee of the registrant's board of
directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or
operation of internal control over financial reporting which are reasonably
likely to adversely affect the registrant's ability to record, process,
summarize, and report financial information; and

(b) Any fraud, whether or not material, that involves management or other
employees who have a significant role in the registrant's internal control over
financial reporting.

Date: 8/27/03
      --------

                                    /s/ Henry Gabbay
                                    --------------------------
                                    Henry Gabbay
                                    Principal Financial Officer

EX-99.906CERT

                                                              Exhibit 99.906Cert



                            SECTION 906 CERTIFICATION


Pursuant to 18 U.S.C. ss. 1350, the undersigned officers of BlackRock Preferred
Opportunity Trust (the "Company"), hereby certifies, to the best of their
knowledge, that the Company's Report on Form N-CSR for the period ended June 30,
2003 (the "Report") fully complies with the requirements of Section 13(a) or
15(d), as applicable, of the Securities Exchange Act of 1934 and that the
information contained in the Report fairly presents, in all material respects,
the financial condition and results of operations of the Company.


Dated: 8/27/03
      --------------------------------------



/s/ Robert Kapito
- ----------------------------------
Name:  Robert Kapito
Title: Principal Executive Officer


/s/ Henry Gabbay
- ----------------------------------
Name:  Henry Gabbay
Title: Principal Financial Officer