Date(s) 
1887- 
1898 
(cont. ) 
1902- 
1909 
1909- 
1915 
1915 
Table 3 (Continued) 
Construction and Rehabilitation History 
on the north jetty and seaward 15,000 ft of the south jetty. A 
portion of the south jetty core from sta 95+64 to sta 133+24 con- 
sisted of clay materials, but this type of construction was abandoned 
due to increasingly difficult methods of placement as the jetty 
advanced into deeper water. The general method of construction in- 
volved extending an apron of large (outside edges) and small sand- 
stone riprap followed by a core of small sandstone riprap up to mlt, 
placing the granite blocks on the core side slopes, and then placing 
the remaining core stone and completing the cover layer. Most of the 
jetty construction was in water depths of less than -12 ft mlt, with 
the other few thousand feet of each jetty in deeper water. The 
jetties' seaward ends terminated at about the -27 ft mlt contour. 
The north and south jetty were completed using approximately 
1,117,000 and 807,000 tons of stone at total costs (adjusted to 1897 
price index) of $3,484,000 and $2,567,000, respectively. 
Following the hurricane of September 1900, repairs were made to the 
jetties. During 1907-1909 the south jetty was extended from 
sta 348+00 to sta 356+00. Nearly all of the south jetty repairs were 
located at its landward end between 6+00 and 143+63 and its seaward 
end between sta 220+00 and sta 348+00. Granite blocks weighing 5 to 
7 tons were placed on the landward section and large (8- to 10-ton) 
and small (less than 8-ton) granite riprap were used on the seaward 
section. The south jetty extension was built up to +5 ft mlt with a 
maximum top width of 20 ft and 1V:1.5H side slopes. The core stone 
consisted of pieces less than 3 tons in weight placed on a 4-ft-thick 
apron of 20- to 120-lb stone. The cover layer stone placed below and 
above -15 ft mlt averaged 6 (minimum of 3) and 10 tons, respectively. 
The south jetty repairs and extension required 128,400 and 
77,700 tons of stone placed at total costs of $387,000 (estimate) and 
$284,000, respectively. In 1908, a concrete cap was placed on the 
south jetty between sta 144+00 and sta 200+00 using 1,680 cu yd of 
concrete and 2,409 tons of chinking stone at a cost of $48,600. The 
majority of the north jetty repairs were completed during 1903-1905 
with 105,000 tons of 10- to 12-ton stone placed between sta 9+00 and 
sta 255+00. During 1907-1909 minor north jetty repairs were made 
between sta 80+00 and sta 285+00 using 11,600 tons of stone. Total 
cost of the north jetty repairs was $450,000. 
Minor repairs were made to the south jetty following the storm of 
July 1909 which damaged sections at its landward (sta 0+00 to 
sta 144400) and seaward (sta 300+00 to sta 346+00) ends. A total of 
22,500 tons of stone was placed, and several thousand tons of 
displaced cover stone were reset. Total repair cost was $131,000. 
A hurricane during August caused some damage to the jetties, but no 
subsequent work was undertaken. The north jetty received the most 
(Continued) 
19 
