. Case histories of Corps breakwater and jetty structures. Report 3. Breakwaters; Jetties; Breakwaters; Jetties. Table 65 Alpena Harbor Breakwater Alpena Harbor, Michigan Construction and Rehabilitation History Date(s) 1939 A 750-ft-long rubble-mound breakwater (Figure 178) was constructed from the shore extending parallel to the entrance channel. 1965 The project was modified, which entailed removal of the existing breakwater and construction of a new 550-ft-long offshore rubble breakwater. The new structure would include an 8-ft crest width, 4-ton cover stone, a crest el of +8 ft Iwd, and 1-
. Case histories of Corps breakwater and jetty structures. Report 3. Breakwaters; Jetties; Breakwaters; Jetties. Table 65 Alpena Harbor Breakwater Alpena Harbor, Michigan Construction and Rehabilitation History Date(s) 1939 A 750-ft-long rubble-mound breakwater (Figure 178) was constructed from the shore extending parallel to the entrance channel. 1965 The project was modified, which entailed removal of the existing breakwater and construction of a new 550-ft-long offshore rubble breakwater. The new structure would include an 8-ft crest width, 4-ton cover stone, a crest el of +8 ft Iwd, and 1- side slopes on the harbor side with 1- side slopes on the lakeside (Figure 178). 1969 The 1965 modification to the project was reclassified into an in- active status based on an unfavorable benefit-to-cost ratio. 1986 The existing breakwater has never undergone maintenance during its lifetime and is considered presently to be in good condition. HARBOR SIDE. i^^ "T^ iuMUli j ⢠]^\ /"«.T ' J i 1 â¢"â " y\ %l CMIG â ^ INOKNA r VICINITY ."jf (NOT CONSTRUCTED) Figure 178. Alpena Harbor, Michigan 276. 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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