49TH CONGRESS, HOUSE OF REPRESENTATIVES. ( Ex. Doc. 1, } pt. 2, vol. II. ANNUAL REPORT OF THE CHIEF OF ENGINEERS, UNITED STATES ARMY, TO THE SECRETARY OF WAR, FOR THE YEAR 1886. IN THREE PARTS. PART I. WASHINGTON: GOVERNMENT PRINTING OFFICE. ERRATA FOR ANNUAL REPORT OF THE CHIEF OF ENGI NEERS, U. S. ARMY, FOR 1886. Page 541.-Heading Improvement of navigation in the Back Cove, Portsmouth Harbor, New Hampshire, should read- Improvement of navigation in the channel of Back Cove, Portland, Maine. to 1876, Page 555.-In estimate, fourth line, change $2 to $1 Page 1231.-Second table, 6th column, box heading, feet First table, 9th column, box heading interested 80 feet to $15,164.83. those short crises 29 feet 29 feet should be 26 should be 26 Page 1246.-Ending fourth paragraph insert, Major Stickney in his report of 1884, saying "the detailed plans for locks not being completed, no new estimate is presented, but it is probable that the cost of such locks as are deemed suitable for. the work will increase the estimate somewhat." Page 1252.—End of fourteenth line, change 8.5 Fifteenth line, change 0.0 feet to .85 to to 0.05 feet .25 inch Page 1257.-Last paragraph, second line, change Page 1258.-Ninth line, change feet to 74.07 to 7,407 Page 1263.-To follow improvement of bayou Courtableau, Louisiana, insert: Appropriations for this work have been as follows: Generally considered there has been a deepening since 1881 of from 1 to 2 feet over the whole area between the jetties, the greatest scour having taken place in the deepest water. The improvement in depth has extended for a distance of 2,000 feet beyond the end of the east jetty, though to a less degree than within. Beyond this there is a small area where no change has occurred, while beyond this again there has been a shoaling of four-tenths of a foot in the line of the channel and out to a depth of 12 feet. Behind the west jetty the water has shoaled from 1 to 4 feet, the greatest shoaling being found near the shore. From a point 1,000 feet beyond the "Clifton" and between the new channel and the foundation of the west jetty, laid in 1883, there has been a shoaling which extends out to the 12-foot depth. The decrease in depth is greatest near the jetty, and diminishes gradually toward the eastward. The bottom over this area is hard sand, and it is evident that the shoaling has been due to the banking up of the westerly sand-drift against the west jetty; for in 1884 this sand bottom was found to extend 14 miles to the eastward of the west jetty, while now sand is only found in isolated spots farther to the eastward than 1,800 feet from the west jetty, and at certain points it completely covers the foundation and has overflowed to the west of the jetty. |