From surveys under the direction of Bvt. Brig. Gen. N., Michler, Maj. of Engineers and Bvt. Lieut. Col. P. S. Mitchie, Capt. of Engineers, by command Bvt. Maj. Genl. A. A. Humphreys, Brig. Genl. & Chief of Engineers. Surveyed & drawn by Maj: J. E. Weyss,