Table 14 (Continued) 



Date(s) Construction and Rehabilitation History 



1897- +8 ft mlw and side slopes of IV: IH and 1V:1.5H above and below mlw, 



1928 respectively (50 percent of stone was to be greater than 7 tons) . 

 (Cont) Cumulative stone quantities placed during this time were about 



340,000 tons on the north jetty and 116,500 tons on the south jetty. 

 Costs since 1895 for new work and maintenance were $1,369,000 and 

 $1,501,000 for the north and south jetties, respectively. 



1929 A centerllne survey of the jetties showed that nearly the entire 

 north jetty and the outer 7,000 ft of the south jetty had an 

 approximate crest elevation of +8 ft mlw. The crest elevation of 

 the inner 4,000 ft of the south jetty varied from to +7 ft mlw. 

 The outer ends of the jetties converged to a distance of 1,600 ft 

 then ran parallel to each other for a distance of 4,000 ft. The 

 water depth at the seaward toes was approximately -20 ft mlw. 



1930 Repairs were made between sta 62+80 and 114+00 of the north jetty 

 with 29,700 tons of granite stone (Figure 24). Nine gaps with an 

 average height of +4 to +5 ft mlw were raised to +8 ft mlw. The 

 crest elevations on the outer 500 ft of the jetty were from -5 to 

 -15 ft mlw. The south jetty was repaired between sta 40+00 and 

 80+90 with 26,600 tons of granite (Figure 25). Twenty major gaps 

 with average heights of +3 to +5 ft mlw were raised to +8 ft mlw. 

 The crest elevations on the outer 700 ft of the jetty were from 

 +3 to -10 ft mlw. The stone size was from 4 to 10 tons with an 

 average size of 6 to 8 tons. The crown width was 10 ft, and the 

 side slopes were IV: IH. Cost of the repairs totaled $228,000. 



1931- Voids below +4 ft mlw on the ocean side of the south jetty were 

 1932 filled with 25- to 100-lb granite stone to stop the flow of sand 



through the structure, and 3,450 tons of stone were placed between 

 sta 36+50 and 54+00 (Figure 25). A 110-ft-long groin (crest eleva- 

 tion +7 ft mlw) constructed of 550 tons of stone was placed at 

 sta 44+56 on the ocean side of the south jetty to stop the flow of 

 water along the jetty. Later, a head section on the groin was con- 

 structed using 245 tons of granite and 50 cu yd of oyster shell. 

 Total cost of the groin was $15,300. The seaward ends of the 

 jetties were repaired (Figure 24), the north between sta 114+00 and 

 128+60 and the south between sta 88+00 and 106+30. Storm waves had, 

 over time, lowered both jetties and created gaps, necessitating the 

 repairs. Gaps (low points) on the jetties ranged from +3 to 

 +4 ft mlw. The outer 500 ft of the north jetty ranged from -5 to 

 -20 ft mlw, and the outer 700 ft of the south jetty ranged from 

 +3 to -12 ft mlw. The armor stone ranged from 8 to 14 tons, and the 

 design section consisted of a 10-ft crest width at +8 ft mlw and 

 IV: IH side slopes. 



(Continued) 



(Sheet 2 of 4) 



44 



