In reply to which you will perceive "the location of the canal is that recommended by General Bernard, and the Board of Internal Improvement, over which he presided," and that it was proposed to feed the canal at Cumberland, and below by a dam to be erected across the Potomac about a mile above Cumberland. The water of the Potomac was to be carried over Wills creek twenty-one or two feet above ordinary water in the creek. Such is the information furnished me by the president of the Canal Company, and by which I have been governed in the location of the road. On the eastern side of Wills creek the grading is finished to the site of the bridge; on the western side I have directed no work to be executed that can have any bearing upon this point. You perceive it has been my study to avoid conflicting with the interests of the Canal Company; but, from the want of knowing the exact location of their works, will occasion to them an increased expense, as reported by Mr. Purcell, of 16,000 dollars if the bridge is constructed at the point now chosen. If, then, the Company will cause the Canal to be located through the gap of Wills mountain, and give me bench marks from which to ascertain the cuttings and embankments they propose making, I will then locate the road on such ground as not to interfere in any manner with their operations, and such as shall be most advantageous for the public interest. I judge the communication of the department was written under the impression that an interference with the works of the Canal Company was unavoidable, and that some compromise of advantages and disadvantages would necessarily have to be made. Such, however, I do not conceive to be the case. I have located as high up the creek as would give room for a six horse team to turn off and on a bridge at right angles with the stream with facility. If the Canal Company make choice of this ground, I have but to make a bridge oblique with the current, and thus avoid the work of the Canal Company. To ascertain this, it is essential that the Canal Company should make choice of the ground and locate their works; after having so done, if they will favor me with plans and sections, with bench marks of reference of the part in the valley of the creek, the road shall be made not to interfere with their interest, which has always been looked upon by me as claiming precedence. I have here pointed out a course for the consideration of the department, differing materially from the one ordered by the letter of the 20th instant. First, in consideration of its not being acquainted with the nature of the case, and, next, with its requiring me to perform a service in no way necessary to a proper understanding of the interests of the Government connected with the road; to do which, surveys, levels, calculations of excavation and embankment must be made, that the time of neither myself nor the officers associated with me could accomplish.