Table 62
Mackinaw Citv Harbor Breakwaters
Mackinaw City, Michigan
I
Date
Construction and Rehabilitation History
Construction of a 600-ft-long causeway, which serves as a breakwater,
1955
was completed by local interests (Figure 172). The structure was
built of rock and concrete. The harbor side o f the structure was
lined with vertical sheetpiling, and the lakeward side was con-
structed with rubble-mound materials with side slopes of about
(the natural angle of repose).
Construction of a 430-ft-long rubble-mound breakwater (Figure 172)
1967
ft lwd with a
was completed. The breakwater had a crest el of
width of 8 ft. One- to two-ton cover stone was used in construction
along with side slopes of
(Section B- ).
B
The outer 200 ft of
the existing breakwater was authorized for federal maintenance.
1986
The breakwaters presently are considered to be in good condition. An
aerial photo of the Mackinaw City Harbor breakwaters is shown in Fig-
ure 173.
\
I
.......
..
........
-
...........
.
.
.
--
I..,.
SECTI ON
Figure 172. Mackinaw City Harbor, Michigan
270
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