Table 3 (Continued) 



Date(s) Construction and Rehabilitation History 



1 93 1 — In January 1947 a storm with an estimated deepwater wave height of 

 1954 26 ft damaged 350 ft of the seaward end of the west breakwater, 

 (cont.) Repair work was undertaken, but no details were found. 



In October 1947 a storm damaged both breakwaters and caused a 30- 

 day delay of repairs resulting from the January 1947 storm. 

 Damages to the west breakwater included (a) 696 ft of road and 

 turnarounds washed away, (b) 56 ft of cap and core stone washed 

 away at the head (this repair already had been completed), and 

 (c) 20 ft of core rock washed away on a section where repairs were 

 incomplete. Damages to the east breakwater included: (a) 766 ft 

 of road washed away and (b) 30 ft of rock washed away on the trunk 

 section. The total material lost was 4,400 tons of cap stone and 

 core stone. 



In January 1952 the seaward ends of both breakwaters experienced 

 minor damage. No details were found. 



During 4-7 March 1954 a north swell with hindcasted deepwater sig- 

 nificant wave height of 26 ft caused estimated breaking wave 

 heights of 34 ft at the structures. Damage was extensive to 

 185 ft and 300 ft of the seaward ends of the east and west break- 

 waters, respectively. Capstone and slope stone (8 tons) were 

 dislodged, and core material was washed down to an elevation of 

 approximately -6.0 ft mllw. This damage initiated action to begin 

 basing repair work on current design criteria rather than simply 

 restoring damaged sections to their original conditions. 



1956 Repairs of damage caused by the March 1954 storm were completed 

 (Figures 5 and 7). Head repairs consisted of a double layer of 

 33-ton unreinforced tetrapods on a 1-V:3-H seaward slope and a 

 1-V:2-H landward slope. Two layers of tetrapods also were ex- 

 tended 250 ft down the sea side of the west breakwater trunk, and 

 the core of both was capped with 2 ft of concrete. 



A total of 400 tetr&oods was placed. To prevent encroachment of 

 the structures on the entrance channel, the breakwaters were 

 shortened slightly, and a 1-V:2-H slope was used on the inboard 

 quadrant of the armor wraparound on the breakwater heads. The 

 total cost of repairs was $1,200,000. 



(Continued) 



(Sheet 2 of 5) 



17 



