Builder: Bellinghara Marine Industries 



Bellingham, Washington 



Installer: Martinsen Builders 



Petersburg, Alaska 



(3) Performance . The users are satisfied with the protection 



afforded by the breakwater. Prior to its installation, winter moorage was 



risky and the boats often had to be moved to more sheltered waters during 

 storms. The outer chain on the base of the V-section in the initial 



breakwater layout broke during a storm (D. Miller, personal communication). 



This connection has been eliminated by the new alinement and new connectors 

 have been installed (see Fig, 12, b). 



Some wire and rod reinforcement is exposed and rusted where the concrete 

 has spalled off, as illustrated in Figure 14, but no progressive deterioration 

 is apparent. The spalling seems to have been the result of construction hand- 

 ling and installation, rather than from use-oriented causes. 



d. Discussion. The breakwater design is well matched to the site condi- 

 tions for construction as well as to exposure and use. In 8 years, the only 

 maintenance has been the straightening of the dog-leg alinement, a well-recog- 

 nized weakness in the initial design layout. The new module connectors also 

 promise to eliminate another weakness — the slack condition that develops as 

 the rubber fender unit loses its resiliency. 



4. Auke Bay, Alaska . 



a. Location. Auke Bay (Fig, 15), located about 20 miles north of Juneau, 

 Alaska, is a popular moorage for pleasure fishing craft of area residents and 

 transient boats during the summer season, 



b. Site Conditions. The upper end of the bay, the breakwater site, is 

 well-sheltered except toward the southeast, where Coghlan Island limits the 

 fetch to about 2.5 miles, except for a very narrow window of about 6 miles. 

 There are no data available on either tides or currents. Currents at the 

 breakwater are not likely to be a concern. No recordings of wake conditions 

 are available. 



c. Breakwater Description , 



(1) Design and Installation, One 60-foot and two 120-foot lengths of 

 48-inch-diameter oil pipe surplussed from the Alayeska project were designed 

 as a replacement for a decayed log breakwater shielding a small, privately 

 owned marina at the head of Auke Bay, The breakwater sections were fabricated 

 in Seattle and barged to Juneau where they were off-loaded, as shown in Figure 

 16, for towing to Auke Bay, A wooden walkway on the pipes provides access to 

 24-inch pipes, also with walkways, which serve as boat slips. The pipes were 

 ballasted with seawater to a 1-foot freeboard. 



The breakwater was installed in July 1980 at a cost of $400 per foot. 

 Anchor chain connection holds the breakwater in place. Those responsible for 

 the breakwater design, construction, and operation are as follows: 



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