Table 37
Chicago Harbor Structures
Chicago, Illinois
Date
Construction and Rehabilitation History
1874
Construction of the 4,338-ft-long northern portion of the inner
breakwater (Figure 97, Sections K, L,
N, 0 , and
was completed.
The breakwater was constructed of stone-filled timber cribs on a
and
1876
Construction of the 960-ft-long north pier (Figure 97) was completed.
The pier was of stone-filled timber crib construction (Figure 98,
It was built on a stone base and was 30 ft in width.
Section
1880
The 2,544-ft-long southern portion of the inner breakwater (Fig-
ure 97, Sections P, R, and s) was constructed. These structures also
were stone-filled timber cribs built on a stone base (Figure 98, Sec-
tions P, R , and
The southern 2,244 ft of breakwater was 16 ft in
length (Sections R and S ) , and the remaining 300-ft portion (Sec-
was 30 ft in width.
tion
1889
Construction of a 5,321-ft-long extension breakwater (Figure 97, Sec-
and E) was completed, This was a stone-filled timber
tions
base with a 30-ft width.
1908
The north pier was capped with a concrete superstructure (Figure 98,
with a crest el of about 4-11 ft lwd.
Section
shore arm extension (Figure 97, Sections A,
1917
A
and B3) and a 2,227-ft-long southerly extension (Figure 97, Sec-
the exterior breakwater were constructed. The shore arm
tion F)
extension was constructed with stone-filled timber cribs (Figure 99,
Sections A ,
B2, and B3) built on a stone base. The shoreward
(Section A) was 24 ft in length, and the remaining
and B3) was 30 ft wide. The southerly
breakwater (Sections
extension was a rubble-mound breakwater with
side slopes
ft lwd, and armor
Its crest el was
(Figure 99, Section F.
)
stone sizes were 3 tons (minimum) from el 4-1.72 ft
to the lake
from el
to
ft
bottom and 7 tons
1920
additional 1,532-ft-long portion of the southerly extension (Fig-
An
ure 97, Section G) was constructed. The extension was a rubble-
and
side
mound structure with a crest el of
ft
)
to the lake bottom to 7 tons (minimum)
(minimum) from el 0.0 ft
from el 0 0 ft
.
ft lwd.
to
(Continued)
\
(Sheet 1 of 3)
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