8 feet. The T head is 71 feet long and 14 feet wide. This wharf is founded on 64 piles. Changes in the east and west jetties, Kipp Dam and the wing-dams, in the year ending June 30, 1878. Tables are given next following which show all changes which have been made in these structures within the year. On the east jetty about 4,000 cords of willows and 12,500 cubic yards of stone have been used. On the west jetty about 1,400 cords of willows and 5,500 cubic yards of stone, and on wing-dams about 1,200 cords of willows and 200 cubic yards of stone, 900 linear feet of mattresses, and 4,000 linear feet of loose willows in layers have been added to the east jetty, 490 linear feet of loose willow layers to the west jetty, and 2,200 linear feet of mattresses to wing-dams. At Grande Bayou, about 1,600 cords of willows and 700 cubic yards of stone were used, and 1,460 linear feet of mattresses, and 520 linear feet of loose willows have been placed. These tables also show the present condition of the three works, and in addition on sheet No. 1 there is a developed plan which shows graphically the state of the mattress and willow work of the jetties, June 30, 1878. All additions to and changes in the jetties and wing-dams have been explained in detail in the proper report, and these tables are therefore only necessary as a recapitulation. The wing-dams are now 33 in number, four having been added during the year. These are designated as follows, viz: A. 6,525. AE. J. 6,525, W. J., and J. and K. Several have been repaired, five to a considerable extent, and others with the expenditure of a less amount of labor and material. Two new wing-dams, J. and K., have been carried away; the latter en masse and the former by piecemeal. EAST JETTY. A tabulated statement of its condition on July 1, 1878, and of the progress made in building it from July 1, 1877, to July 1, 1878. 1.0 *Including one of loose willows. A layer of willows 30 feet long, making an angle of 70° with upper prolongation of jetty. Top of jetty covered with a foot or more of river sediment. Exact thickness of stone cannot be determined; probably about 1 foot thick. Mattresses sunken along sea side of jetty piling, making a second wall. Shown on plan sheet No. 1. WEST JETTY. A tabulated statement of its condition on July 1, 1878, and of the progress made in building it from July 1, 1877, to July 1, 1878. 15 11.. 10 above.. 10 8. 330 7. +0.3 * Willows used for filling a break in the jetty that occurred March 24, 1878. Top tier of willows broken by storms. -2.9, about KIPP DAM. A tabulated statement of its condition on July 1, 1878, and of the progress made in building it from July 1, 1878, to July 1, 1878. The last division, 40 feet, extends over the land, and is covered with a thin, narrow layer of stone. The following table gives a comparison of the quantities of water in 21 subdivisions of an area containing about 14 square miles, immediately seaward of the ends of South Pass jetties, based on the charts of surveys, made respectively about June 20, 1876, June 22, 1877, and July 19, 1878, by Capt. M. R. Brown, Corps of Engineers, U. S. A.: |