. Case histories of Corps breakwater and jetty structures. Report 3. Breakwaters; Jetties; Breakwaters; Jetties. Table 62 Mackinaw City Harbor Breakwaters Mackinaw City, Michigan Date(s) 1955 Construction and Rehabilitation History 1967 1986 Construction of a 600-ft-long causeway, which serves as a breakwater, was completed by local interests (Figure 172). The structure was built of rock and concrete. The harbor side of the structure was lined with vertical sheetpiling, and the lakeward side was con- structed with rubble-mound materials with side slopes of about IV:IH (the natural angle of rep
. Case histories of Corps breakwater and jetty structures. Report 3. Breakwaters; Jetties; Breakwaters; Jetties. Table 62 Mackinaw City Harbor Breakwaters Mackinaw City, Michigan Date(s) 1955 Construction and Rehabilitation History 1967 1986 Construction of a 600-ft-long causeway, which serves as a breakwater, was completed by local interests (Figure 172). The structure was built of rock and concrete. The harbor side of the structure was lined with vertical sheetpiling, and the lakeward side was con- structed with rubble-mound materials with side slopes of about IV:IH (the natural angle of repose) • Construction of a 430-ft-long rubble-mound breakwater (Figure 172) was completed. The breakwater had a crest el of + ft Iwd with a width of 8 ft. One- to two-ton cover stone was used in construction along with side slopes of 1 (Section B-B). The outer 200 ft of the existing breakwater was authorized for federal maintenance. The breakwaters presently are considered to be in good condition. An aerial photo of the Mackinaw City Harbor breakwaters is shown in Fig- ure Figure 172. Mackinaw City Harbor, Michigan 270. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bottin, Robert R; U. S. Army Engineer Waterways Experiment Station; United States. Army. Corps of Engineers; Repair, Evaluation, Maintenance, and Rehabilitation Research Program. [Vicksburg, Miss. : U. S. Army Engineer Waterways Experiment Station ; Springfield, Va. : available from National Technical Information Center]
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