Table 23 (Continued)
Construction and Rehabilitation History
A monolith concrete block was placed at the outer end of the north
1930
jetty.
Maintenance work on the north jetty required 236,342 tons of stone.
1940
At least
stone
percent of the stone above the core was class
weighing between 6 and 25 tons and averaging 10 tons. The stone was
placed by dumping from cars on a tramway.
The south jetty was restored, and monolith concrete cap was placed on
1942
the outer 650 ft.
A small-boat mooring basin at Charleston was authorized.
1948
The small-boat mooring basin at Charleston was constructed, including
a 2 , 1 0 0 - f t breakwater and a silt barrier bulkhead. The breakwater
1957
mllw, a crest width of 18 ft, and
had a crest elevation of +14
required an estimated 67,000 tons of stone, of which at least 35 per-
stone weighing 3,000 to 8,000 lb and averaging
cent was class
5,000 lb. No more than 30 percent was class
weighing between 25
and 500 lb, and the rest was class
weighing 500 to 3,000 lb and
vehicle.
The outer 2,879 ft of the north jetty was repaired to crest elevation
+25 ft mllw and a 30- ft crest width using 246,529 tons of stone. The
1958
stone weighing at
design specified a minimum of 45 percent class
least 6 tons and averaging 10 tons, no more than 20 percent class
stone weighing less than 1 ton, and the remaining class
stone
weighing between 1 ton and 6 tons and averaging tons.
and
re-
The south jetty was repaired between stations
quiring 235,000 tons of stone. The armor layer over the outer
1963
consisted of a 10-ft layer of Class
stone above mllw,
1,880
underlain by a 5-ft layer of Class
stone in the outer
ft.
Below mllw, the armor layer consisted of a 5-ft layer of Class
stone. Based on a unit weight of 165 to 170 pcf, select class
stone weighed a minimum of 16.5 tons, class
stone weighed between
tons and 16.5 tons and averaged 11 tons, and class
stone
weighed between 2 tons and tons and averaged 4.5 tons. The rock
was placed and keyed by crane.
The north jetty was deteriorating at an average rate of 60
annu-
1969
ally since the
repairs.
The outer 700 ft of the north breakwater was repaired.
1970
Erosion began on the spit adjacent to and north of the breakwater at
the small-boat basin.
(Continued)
117
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