EXHIBIT 15.1 AWARENESS LETTER--UNAUDITED INTERIM FINANCIAL INFORMATION Cross Timbers Royalty Trust Dallas, Texas We are aware that our report dated May 2, 2001, which was included in the Cross Timbers Royalty Trust's Quarterly Report on Form 10-Q for the quarter ended March 31, 2001, is being incorporated by reference in this Registration Statement on Form S-3. We also are aware that the aforementioned report, pursuant to Regulation C under the Securities Act of 1933, is not considered a part of the Registration Statement prepared or certified by our firm within the meaning of Sections 7 and 11 of that Act. ARTHUR ANDERSEN LLP Fort Worth, Texas June 21, 2001