Exhibit 99.1



LOGO

March 1, 2013

Ms. Lee Ann Anderson

San Juan Basin Royalty Trust

Compass Bank, Trustee

300
West 7thStreet, Suite B

Fort Worth, Texas 76102



Re:

Evaluation SummarySan Juan Basin Royalty Trust InterestsProved ReservesAs of December 31,
2012


Dear Ms. Anderson:

As requested, we are submitting our estimates of proved reserves and our forecasts of the resulting economics attributable to the above captioned interests. It is our understanding that the proved
reserves estimated in this report constitute 100 percent of the proved reserves owned by the San Juan Basin Royalty Trust, all of which are located in the San Juan Basin of northwestern New Mexico.

Composite reserve estimates and economic forecasts for the proved reserves are summarized below:



|                         |  |           |  |                 |           |  |               |  |         |             |  |  |          |  |  |  |           | 
|------------------------ |  | --------- |  | --------------- | --------- |  | ------------- |  | ------- | ----------- |  |  | -------- |  |  |  | --------- | 
|                         |  |           |  | Proved Reserves |          
|                         |  |           |  | Producing       |           |  | Non-Producing |  |         | Undeveloped |  |  | Total    | 
|Net Reserves             |  |           |  |                 |           |  |               |  |         |             |  |  |          |  |  |  |           | 
|Oil/Condensate           |  | -    Mbbl |  |                 | 189.5     |  |               |  | 2.6     |             |  |  | 12.0     |  |  |  | 204.1     | 
|Gas                      |  | -    MMcf |  |                 | 99,549.1  |  |               |  | 1,582.5 |             |  |  | 3,316.1  |  |  |  | 104,447.7 | 
|                         |  |           |  |                 |          
|Revenue                  |  |           |  |                 |           |  |               |  |         |             |  |  |          |  |  |  |           | 
|Oil/Condensate           |  | -    M$   |  |                 | 15,707.8  |  |               |  | 215.0   |             |  |  | 992.4    |  |  |  | 16,915.2  | 
|Gas                      |  | -    M$   |  |                 | 366,906.9 |  |               |  | 6,151.3 |             |  |  | 11,059.0 |  |  |  | 384,117.1 | 
|                         |  |           |  |                 |          
|Production Severance Tax |  | -    M$   |  |                 | 35,302.5  |  |               |  | 587.1   |             |  |  | 1,115.2  |  |  |  | 37,004.8  | 
|                         |  |           |  |                 |          
|Operating Expense        |  | -    M$   |  |                 | 0.0       |  |               |  | 0.0     |             |  |  | 0.0      |  |  |  | 0.0       | 
|                         |  |           |  |                 |          
|Operating Income (BFIT)  |  | -    M$   |  |                 | 347,312.1 |  |               |  | 5,779.2 |             |  |  | 10,936.2 |  |  |  | 364,027.5 | 
|                         |  |           |  |                 |          
|Discounted @ 10%         |  | -    M$   |  |                 | 209,566.4 |  |               |  | 2,985.0 |             |  |  | 1,013.2  |  |  |  | 213,564.6 | 



---

Ms. Lee Ann Anderson

San Juan Basin Royalty Trust Interests

March 1, 2013

Page
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The
discounted value shown above should not be construed to represent an estimate of the fair market value by Cawley, Gillespie & Associates, Inc.

As to the assumptions, methods and procedures used in connection with the preparation of this report, prices were forecast in accordance with Securities and Exchange Commission guidelines using average
annual prices of $2.64 per MMBtu (San Juan) and $94.71 per barrel (WTI Cushing). Gas price adjustments were specified by property with values ranging from 0.60 to over 1.80. The adjusted volume-weighted average gas price over the life of the
properties is $3.61 per Mcf. The oil price was adjusted for an overall differential of -$11.84 per barrel.

Operating expenses
and capital costs were based on an analysis of data provided by ConocoPhillips (on behalf of Burlington Resources Oil & Gas Company LP). Operating expenses include direct lease operating expenses and administrative overhead. Investments
include drilling costs, work-over costs and production equipment costs. Severance taxes were forecast as 9.85% and 9.20% of oil and gas revenue, respectively. Neither expenses nor investments were escalated. The cost of plugging and the salvage
value of equipment have not been considered.

The proved reserve classifications conform to criteria of the Securities and
Exchange Commission. The reserves and economics are predicated on the regulatory agency classifications, rules, policies, laws, taxes and royalties in effect on the effective date except as noted herein. The possible effects of changes in
legislation or other Federal or State restrictive actions have not been considered. The reserves were estimated using a combination of the production performance, volumetric and analogy methods, in each case as we considered appropriate and
necessary to establish the conclusions set forth herein. All reserve estimates represent our best judgment based on data available at the time of preparation and assumptions as to future economic and regulatory conditions. Due to the inherent
uncertainties of reserves estimates, it should be realized that the reserves actually recovered, the revenue derived therefrom and the actual cost incurred could be more or less than the estimated amounts.

The reserve estimates were based on interpretations of factual data furnished by ConocoPhillips and the San Juan Basin Royalty Trust.
Liquid and gas price information, cost and expense history, subject wells and ownership were supplied by ConocoPhillips and were accepted as furnished. To some extent, information from public records has been used to check and/or supplement these
data. The basic engineering and geological data were utilized subject to third party reservations and qualifications. Nothing has come to our attention, however, that would cause us to believe that we are not justified in relying on such data. An
on-site inspection of these properties has not been made nor have the wells been tested by Cawley, Gillespie & Associates, Inc.

Our work-papers and related data are available for inspection and review by authorized parties.

Respectfully submitted,



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CAWLEY, GILLESPIE & ASSOCIATES, INC.

Texas Registered Engineering Firm F-693

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