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Exhibit 31

CERTIFICATION

I, Lee Ann Anderson, certify that:

1.     I have reviewed this Quarterly Report on Form 10-Q of San Juan Basin
Royalty Trust, for which TexasBank acts as Trustee;

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, distributable income and changes in trust corpus of
the registrant as of, and for, the periods presented in this report;

4.     I am responsible for establishing and maintaining disclosure controls
and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)), or
for causing such procedures to be established and maintained, for the
registrant and have:



| | a) |  | Designed such disclosure controls and procedures, or caused
such disclosure controls and procedures to be designed, to ensure
that material information relating to the registrant, including its
consolidated subsidiaries, is made known to me by others within those
entities, particularly during the period in which this report is
being prepared;                               
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| | b) |  | Evaluated the effectiveness of the registrants disclosure
controls and procedures and presented in this report my conclusions
about the effectiveness of the disclosure controls and procedures, as
of the end of the period covered by 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 quarter (the registrants fourth
fiscal quarter 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.     I have disclosed, based on my most recent evaluation of internal
control over financial reporting, to the registrants auditors:



| | 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
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| | b) |  | Any fraud, whether or not material, that involves persons who
have a significant role in the registrants internal control over
financial reporting.                                                                                                                     

In giving the certifications in paragraphs 4 and 5 above, I have relied to the
extent I consider reasonable on information provided to me by Burlington
Resources Oil & Gas Company LP.

|                        |  |                                                            |  |                                 
|----------------------- |  | ---------------------------------------------------------- |  | --------------------------------
|                        |  | TEXASBANK, AS TRUSTEE FOR THE
SAN JUAN BASIN ROYALTY TRUST
|                        |  |                                                            |  |                                 
|Date: November 13, 2003 |  | By:                                                        |  | /s/ LEE ANN ANDERSON            
|                        |  |                                                            |  |                                 
|                        |  |                                                            |  | Lee Ann Anderson                
|                        |  |                                                            |  | Vice President and Trust Officer