Table 52 (Concluded)
Construction and Rehabilitation History
(Figure 146) of the north pier was enclosed in steel sheetpiling with
a concrete cap from the channel piling to the existing concrete and
stone fill from that point shoreward. The el of this section was
ft lwd. Rehabilitation to Sections M, N, 0, and 0 of the south
1
breakwater (Figure 147) involved the placement of stone to each side
of the breakwater. Stone was placed to an el of
with
ft
side slopes. Cover stone ranging from 5 (min) to 7 tons
(max) was placed adjacent to Sections M and N, while cover stone
was placed adjacent Sec-
ranging from 1.5 (min) to 2.5 tons
tion 0 and 0-1. Stone was placed only on the lakeside of Sections P
to 1 tons
0
and
(Figure 147). Cover stone ranging from 7
(max) was used at the pierhead (Section
while 0.5-ton riprap was
placed adjacent to Section P. Side slopes were
and crest
els were
ft lwd.
Approximately 1,016 tons of riprap (0.5 to 4 tons) was placed along
1980
the channel side of the north pier to reduce scouring, and about
110 tons of stone fill was placed in the cells of the south
breakwater.
Riprap (2,024 tons) ranging from 3 to 16 tons was placed along the
1982
lakeside of the south breakwater, and about 2,545 tons of 0.5- to
3-ton riprap was installed on the channel side of the structure as
toe protection. A total of 529 tons of riprap was placed along the
channel side of the north pier as toe protection. This stone ranged
from 0.5 to 3 tons in weight. Stone fill was replenished at the head
of the south breakwater and on the channel side of the south pier
also during this year.
An inspection of the structures revealed them to be, generally, in
1985
fair condition. Minor settlement and cracking of the concrete cap
was observed along the north pier indicating some fill stone settle-
ment. Loss of fill stone and superstructure misalignment, settle-
ment, and cracking indicates substructure deterioration of the south
breakwater. Repairs consisting of stone replenishment and new con-
crete caps along with additional riprap within the next 2 years have
been recommended. An aerial photo of Manistee Harbor structures is
shown in Figure 148.
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