**Exhibit 31** **CERTIFICATION**     I, Lee Ann Anderson, certify that:     1. I have reviewed this Annual Report on    Form 10-K    of San Juan Basin Royalty Trust, for which Compass Bank    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))    and internal control over financial reporting (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 disclosure controls and procedures to be designed    under my supervision, 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;     b) Designed such internal control over financial reporting,    or caused such internal control over financial reporting to be    designed under my supervision, to provide reasonable assurance    regarding the reliability of financial reporting and the    preparation of financial statements for external purposes;     c) 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     d) 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 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.      By: /s/  Lee    Ann Anderson    Lee Ann Anderson    Vice President and Senior Trust Officer,    Compass Bank     Date: March 1, 2007