**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, forwhich TexasBank acts as Trustee;     2. Based on my knowledge, this report does not contain any untrue statement of a material factor omit to state a material fact necessary to make the statements made, in light of thecircumstances under which such statements were made, not misleading with respect to the periodcovered by this report;     3. Based on my knowledge, the financial statements, and other financial information includedin this report, fairly present in all material respects the financial condition, distributableincome and changes in trust corpus of the registrant as of, and for, the periods presented in thisreport;     4. I am responsible for establishing and maintaining disclosure controls and procedures (asdefined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financialreporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and I have: a) Designed such disclosure controls and procedures, or caused such disclosurecontrols and procedures to be designed under my supervision, to ensure that materialinformation relating to the registrant, including its consolidated subsidiaries, ismade known to me by others within those entities, particularly during the period inwhich this report is being prepared;  b) Designed such internal control over financial reporting, or caused suchinternal control over financial reporting to be designed under my supervision, toprovide reasonable assurance regarding the reliability of financial reporting and thepreparation of financial statements for external purposes;  c) Evaluated the effectiveness of the registrant’s disclosure controls andprocedures and presented in this report my conclusions about the effectiveness of thedisclosure controls and procedures, as of the end of the period covered by this reportbased on such evaluation; and  d) Disclosed in this report any change in the registrant’s internal control overfinancial 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 hasmaterially affected, or is reasonably likely to materially affect, the registrant’sinternal control over financial reporting; and     5. I have disclosed, based on my most recent evaluation of internal control over financialreporting, to the registrant’s auditors: a) All significant deficiencies and material weaknesses in the design or operationof internal control over financial reporting which are reasonably likely to adverselyaffect the registrant’s ability to record, process, summarize and report financialinformation; and  b) Any fraud, whether or not material, that involves persons who have asignificant 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 considerreasonable on information provided to me by Burlington Resources Oil & Gas Company LP.        Date:  August 9, 2005 By:  /s/ Lee Ann Anderson    Lee Ann Anderson    Vice President and Trust Officer