272 REPORT OF BOARD OF CONSULTING ENGINEERS, PANAMA CANAL. TABLE III.-ENTRANCE DEPTHS, 1905, OF PRINCIPAL COMMERCIAL AND NAVAL SEACOAST HARBORS OF THE UNITED STATES. [Furnished by Brig. Gen. A. Mackenzie, Chief of Engineers, U. S. Army.] NOTE.-Where not otherwise indicated, the depth given is the least sounding near the axis of the entrance channel of the harbor (irrespective of its width) at the stage of tide specified at the top of the column. In some cases the latest reports do not state the depth but give the maximum draft available. As the information concerning high water at lowest neap tides, and also concerning depths at a number of localities, was obtained from sources other than official reports of officers of the Corps of Engineers, attention is invited to Table IV, giving data and reduction methods used. Locality. Eastport, Me........................... Bar Harbor, Me ....................... Bar Harbor-Harbor of Refuge, Me ... Penobscot Bay, Me.................... Rockland, Me ......................... Portland, Me .......................... Gosport, N. H. (Isle of Shoals) ........ Portsmouth, N. H ..................... Sandy Bay, Mass ...................... Boston, Mass .......................... Provincetown, Mass................... New Bedford, Mass.................... Fall River, Mass....................... Narragansett Bay: Eastern entrance.................. Western entrance ................. Providence, R.I....................... New London, Conn.................... New Haven, Conn..................... New York Harbor: East River......................... Southern Entrance................ Delaware Bay, National Harbor of Refuge. Philadelphia, Pa ...................... Baltimore,Md......................... Washington, D.C...................... Newport News, Va..................... Norfolk,Va............................ Wilmington, N.C...................... Winyah Bay, S. C ..........-A ......... Charleston, S. C... ............... Port Royal Naval Station, S. C......... Savannah, Ga ........................ Depth at mean low water. I* I Feet. b1l.5 20.5 42.0 66.0 30.0 b 30.0 33.0 39.0 33.0 b27.0 48.0 b 18.0 25.0 78.0 30.0 25.0 b 23.0 b20.0 b26.0 30.0 30.0 b 22. 0 b 30.0 b19.0 b 30.0 b 28.0 18.0 b 13.0 26.0 19.0 19.0 Depth at high water of lowest neap tide. a Feet. 27.0 29.7 51.2 73.7 37.9 37.1 40.0 46.3 40.7 34.9 55.6 20.9 28.6 80.6 32.6 28.0 24.6 25.0 30.1 33.5 33.3 26.4 30.9 21.3 32.0 30.1 19.9 15.7 29.9 24.0 24.2 Remarks. Depths in Lubec channel. The depth in the northeastern approach exceeds .30 feet at mean low water. Depths over a limited area behind the breakwater; depths to wharves are considerably less. Depths in a narrow channel at southern end of breakwater; depths behind breakwater and at northern entrance exceed 45 feet at mean low water. An entrance depth of 30 feet at mean low water is available through Broad Sound to President Roads near Fort Independence; operations are in progress to provide a channel 35 feet deep at mean low water. Contracts for dredging call for completion December 31, 1907. Depths at anchorage. Operations are in progress to provide a new entrance through Ambrose Channel, 40 feet deep at mean low water. The available depth in this channel June 30, 1905, was 22 feet at mean low water. The amount of dredging required was estimated as 52,800,000 cubic yards. The total amount excavated to August 31, 1905, was 16,149,557 cubic yards. Depth available over a considerable area behind breakwater. Operations are in progress to provide a channel 30 feet deep at mean low water at an estimated cost of $5,810,000. June 30, 1905, $3,247,626.90 had been expended. Operations are in progress under a project adopted March 3, 1905, to provide a channel 35 feet deep at mean low water at an estimated cost of $3,465,000. Dredging commenced in July, 1905. The existing projects provide for channels 20 feet deep at Washington and 24 feet in the Potomac River below Washington. The dredging of the 24-foot channel below Washington has been completed. Channel to navy-yard. The existing project provides for a mean low water depth of 20 feet. It was estimated at the end of August, 1905, that the channel was 62 per cent completed. Operations are in progress to provide a channel 15 feet deep at mean low water. It was estimated at the end of August, 1905, that about 87 per cent of the work had been done. Operations are in progress to provide a channel 28 feet deep at mean high water (giving about 21.5 feet at mean low water and about 26.7 feet at high water of lowest neap tide), at an estimated cost of $1,777,791. All inside dredging provided for under approved project has been completed. Expenditures to end of August, 1905, $1,180,128.92. a Obtained in all cases by adding range of high water at lowest neap tide to depth at mean low water as given in preceding column. b Maximum draft available at mean low water June 30, 1905. I i