##### 



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 quarterly 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
quarterly report;

3.     Based on my knowledge, the financial statements, and other financial
information included in this quarterly 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 period presented in this quarterly
report;

4.     I am responsible for establishing and maintaining disclosure controls
and procedures (as defined in Exchange Act Rules 13a-14 and 15d-14), or for
causing such procedures to be established and maintained, for the registrant
and I have:

| |  |                                                                                                                                                                                                                                                                                                                                                           
| |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| |  | a) designed such disclosure controls and procedures, or caused such
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 quarterly report is
being prepared;
| |  |                                                                                                                                                                                                                                                                                                                                                           
| |  | b) evaluated the effectiveness of the registrants disclosure
controls and procedures as of a date within 90 days prior to the
filing date of this quarterly report (the Evaluation Date); and                                                                                                                                                          
| |  |                                                                                                                                                                                                                                                                                                                                                           
| |  | c) presented in this quarterly report my conclusions about the
effectiveness of the disclosure controls and procedures based on my
evaluation as of the Evaluation Date;                                                                                                                                                                                  

5.     I have disclosed, based on my most recent evaluation, to the
registrants auditors:

| |  |                                                                                                                                                                                                                                                                                                  
| |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| |  | a) all significant deficiencies in the design or operation of
internal controls which could adversely affect the registrants
ability to record, process, summarize and report financial data and
have identified for the registrants auditors any material
weaknesses in internal controls; and
| |  |                                                                                                                                                                                                                                                                                                  
| |  | b) any fraud, whether or not material, that involves persons who
have a significant role in the registrants internal controls; and                                                                                                                                                              

6.     I have indicated in this quarterly report whether or not there were
significant changes in internal controls or in other factors that could
significantly affect internal controls subsequent to the date of my most recent
evaluation, including any corrective actions with regard to significant
deficiencies and material weaknesses.

In giving the certifications in paragraphs 4, 5 and 6 above, I have relied to
the extent I consider reasonable on information provided to me by Burlington
Resources Oil & Gas Company LP.

Date: August 13, 2003

| |                                                            |                                                                            |  | 
| | ---------------------------------------------------------- | -------------------------------------------------------------------------- |  | 
| | TEXASBANK, AS TRUSTEE FOR THE
SAN JUAN BASIN ROYALTY TRUST
|
| | By                                                         | /s/ Lee Ann AndersonLee Ann Anderson
     Vice President and Trust Officer