3 Summary and 

 Recommendations 



Coastal structures previously monitored under the MCNP program at 

 14 sites were inspected from June 1997 through September 1998. These 

 were expedient, low-cost assessments consisting of walking inspections 

 and/or boat surveys. Changes in the structures since they were last sur- 

 veyed were noted. Summaries of the results as well as recommendations 

 are presented in the following subparagraphs: 



a. Inspection of the Nawiliwili Harbor breakwater, Kauai, HI, indicated 

 that there was very little change in armor unit positions compared 

 with the previous survey of 1995. Broken armor units were ob- 

 served (as in 1995) as well as surface spalling of concrete for some 

 of the armor units. The structure is not felt to be in danger of insta- 

 bility and overall is in good condition. It should be inspected peri- 

 odically, and particularly subsequent to periods of high wave energy. 



b. Inspection of the Kahului Harbor breakwaters, Maui, HI, indicated 

 that most of the armor unit positions were similar to those of the pre- 

 vious survey of 1993. Two armor units had flipped and slid 

 downslope on the east breakwater and two additional broken units 



(a total of 11 versus 9 in 1993) were noted on the sea side of the 

 structure. A concentration of broken armor units was observed on 

 the sea side of the head of the west breakwater; however, these were 

 documented during the 1993 survey. No voids or breaches were 

 noted in the breakwaters and the overall condition of the structures 

 was considered good. They should be inspected periodically, par- 

 ticularly after significant storm events. 



c. Inspection of the Laupahoehoe breakwater, Hawaii, HI, indicated 

 that the armor units were in the same positions as documented in the 

 previous survey of 1993. No broken armor units were observed, 

 and the structure is in excellent condition. It should be inspected 

 periodically. 



d. Inspection of the Yaquina Bay north jetty, Oregon, indicated that the 

 outer 50 m (165 ft) no longer existed above the waterline as com- 

 pared with the previous survey of 1993. Remnants of some of the 



50 Chapter 3 Summary and Recommendations 



