Surveyed in accordance with act of Congress approved August 5, 1886 to accompany report of Lt. Col. Geo. L. Gillespie, Corps of Engrs. U.S.A.
"U.S. Engineer Office, Boston, Mass, November 28, 1887. Respectfully forwarded with letter of this date to the Chief of Engineers, Washington, D.C."
Soundings are expressed in feet and tenths and are taken at low tide.