Exhibit 99
 
  
 Re:
    
    Estimates of Proved Reserves,
Future Production Rates, and
Future Net Revenues for the
BP Prudhoe Bay Royalty Trust
As of
December 31, 2009
    Two
Houston Center  909 Fannin Street, Suite 1300  Houston, Texas 77010  Telephone 713-651-9455  Telefax 713-654-9914  e-mail@millerandlents.com




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The Bank of New York Mellon
    
    February 19, 2010Trustee, BP Prudhoe Bay Royalty Trust
    
    Page 2
      1.
    
    A large body of basic data and detailed analyses are available and were used
in making
the estimates. In our judgment, the quantity and quality of currently available
data on reservoir boundaries, original fluid contacts, and reservoir rock and fluid
properties are sufficient to indicate that any future revisions to the estimates of
total original in-place volumes should be minor. Furthermore, the data and analyses
on recovery factors and future production rates are sufficient to support the
Proved Reserves estimates.2.
    
    The methods and procedures employed to accumulate and evaluate the necessary
information and to estimate, document, and reconcile reserves, annual production
rate forecasts, and future net revenues are effective and are in accordance with
generally accepted geological and engineering practice in the petroleum industry.3.
    
    Based on our limited independent tests of the computations of reserves,
production
flowstreams, and future net revenues, such computations were performed in
accordance with the methods and procedures described to us.




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The Bank of New York Mellon
    
    February 19, 2010Trustee, BP Prudhoe Bay Royalty Trust
    
    Page 3
 4.
    
    The estimated net remaining Proved Reserves attributable to the BP Prudhoe
Bay
Royalty Trust as of December 31, 2009, of 68.144 million barrels of oil and
condensate are, in the aggregate, reasonable. Of the 68.144 million barrels of
total Proved Reserves, 57.077 million barrels are Proved Developed Reserves, and
11.067 million barrels are Proved Undeveloped Reserves.5.
    
    The 2009 average West Texas Intermediate price of $61.18 per barrel,
applicable under
current SEC regulations, represents the
12-month average of the
first-day-of-the-month price for each month within the 12-month period prior to
December 31, 2009. Based on this price, other economic parameters as prescribed by
the Overriding Royalty Conveyance, and utilizing the specified procedures outlined
in Financial Accounting Standards Board Accounting Standards Codification 932,
Extractive Activities  Oil and Gas,BP Exploration (Alaska) Inc.
calculated that as of December 31, 2009 production of the Proved Reserves will
result in Estimated Future Net Revenues of $1,331.3 million and Present Value of
Estimated Future Net Revenues of $836.6 million to the BP Prudhoe Bay Royalty
Trust. These estimates are reasonable.6.
    
    BP Exploration (Alaska) Inc. has undertaken a program of field-wide
infrastructure
renewal, pipeline replacement, and well mechanical improvements. As a consequence
of the required downtime for these activities, and the natural production decline,
BP Exploration (Alaska) Inc.s net production of oil and condensate from Proved
Reserves was less than 90,000 barrels per day on an annual average basis in 2009.
BP Exploration (Alaska) Inc. expects that its net production of oil and condensate
from Proved Reserves will be less than 90,000 barrels per day on an average basis
for most future years. The BP Exploration (Alaska) Inc. projection of its future
net production of oil and condensate is reasonable.7.
    
    Production attributable to the BP Prudhoe Bay Royalty Trust will decline with
the BP
Exploration (Alaska) Inc. production. However, the Per Barrel Royalty will not have
a positive value if the West Texas Intermediate Price is less than the sum of the
per barrel Chargeable Costs and per barrel Production Taxes, appropriately adjusted
in accordance with the Overriding Royalty Conveyance. Under such circumstances,
average daily production attributable to the BP Prudhoe Bay Royalty Trust will have
no value and therefore will not contribute to the reserves regardless of BP
Exploration (Alaska) Inc.s net production level.8.
    
    Based on the SEC-defined 12-month average West Texas Intermediate Price of
$68.18
per barrel, and Production Taxes and Adjusted Chargeable Costs as prescribed by the
Overriding Royalty Conveyance, the projection that royalty payments will continue
through the year 2023 is reasonable. BP Exploration (Alaska) Inc. expects continued




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The Bank of New York Mellon
    
    February 19, 2010Trustee, BP Prudhoe Bay Royalty Trust
    
    Page 4
 economic production at a declining rate through the year 2060; however, for the
economic conditions and production forecast as of December 31, 2009 the Per Barrel
Royalty will be zero following the year 2023. Therefore, no reserves are currently
attributed to the BP Prudhoe Bay Royalty Trust after that date.9.
    
    Even if expected reservoir performance does not change, the estimated reserves,
economic life, and future revenues attributable to the BP Prudhoe Bay Royalty Trust
may change significantly in the future. This may result from changes in the West
Texas Intermediate Price or from changes in other prescribed variables utilized in
calculations defined by the Overriding Royalty Conveyance.




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The Bank of New York Mellon
    
    February 19, 2010Trustee, BP Prudhoe Bay Royalty Trust
    
    Page 5




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The Bank of New York Mellon
    
    February 19, 2010Trustee, BP Prudhoe Bay Royalty Trust
    
    Page 6
  Yours very truly,
MILLER AND LENTS, LTD.
Texas Registered Engineering Firm No. F-1442By:
    /s/ William P. Koza
    [Seal]William P. Koza, P.E.Senior ConsultantBy:
    /s/ Carl D. Richard
    [Seal]Carl D. Richard, P.E.Senior Vice President