Table 28 (Continued)
Date
Construction and Rehabilitation History
seaward in each of these years
The north jetty was extended 400
(1,200-ft total) at a cost of ,940,,800,and ,000,respec-
1914
tively. Extensions were 6.0 ft wide with
mlw pile elevations
mlw stone elevations.
and
1915
Both jetties were repaired by adding or replacing broken and decayed
timber or piling, and a preservative was applied to tops of piles.
Stone was placed to fill settled sections. The cost of repairs was
,312.
The south jetty was extended 700
to a total length of 5,800 ft
1920
jetty. Both jetties were repaired in the same manner as the 1915
repairs. Costs of repairs and the extension were ,422 and ,033,
respectively.
The north jetty was extended 3,500 ft seaward at a cost of 9,140,
1939
using
construction geometry.
1944
Tops of piles were coated with tar on the north jetty near the river
mouth at a cost of 0.
1948
The north jetty was repaired beginning 708 ft from the shoreward end
and extending 942
seaward. The original timber crib section was
repairs was ,493, and 4,870 tons of stone were used.
A survey of the north jetty indicated there was no visible trace of
1963
the shoreward 708 ft. The total length of the existing jetty was
5,642 ft. The shoreward, rubble-mound, end had an average height of
ft mlw. The 1,200-ft-long timber crib structure adjacent to the
rubble-mound section had deteriorated. Upper crib work was virtually
nonexistent, and tops of piles were rotted or broken off. Stone had
settled an average of 2.8 ft from design, was displaced, and had
spilled out between piles. Piles, tie rods, and wales in the most
seaward 3,500 ft appeared to be in good condition. Stone had settled
an average of 1.5 ft in this section.
Minor rehabilitation was done on the north jetty at a cost of
1964
The 1,200-ft-long deteriorated timber crib section was
rehabilitated t o a rubble-mound structure. The center line of the
rubble-mound structure was placed north of the center line of the
timber crib jetty to prevent failure of the jetty on the channel side
due to lateral forces. The offset was 11.0 ft over a distance of
650 ft and
ft over a distance of 400 ft, shoreward and seaward
ends of the section, respectively. Transition sections were on
'either end of the new structure and between the two offset sections.
ft mlw, crown width was 1 . ft, and side
Crest elevation was
00
slopes were
Twenty-five ton minimum capstone was placed
(Continued)
59
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