Table 32 (Concluded) 



Date(s) Construction and Rehabilitation History 



1958 An extension of the north and south Jetties was authorized. 



1966 The north Jetty was extended to 7,000 ft. The crest elevation was 

 +20 ft mllw, crest width was 30 ft, side slopes were 1:2 above mllw 

 and 1:1.5 below mllw. Stone weights, based on 165 pcf, were a mini- 

 mum of 20.5 tons for select class "A", a minimum of 13.5 tons and an 

 average of 17 tons for class "A", and a minimum of 5.5 tons and an 

 average of 9 tons for class "B". The work required 80,904 tons of 

 select class "A" stone, 274,243 tons of class "A" stone, 192,612 tons 

 of class "B" stone, 116,296 tons of class "C" stone, and 125,024 tons 

 of bedding material. Stones used in the armor layer were individ- 

 ually placed by crane. 



I97O- The south Jetty was extended to 7,600 ft. The crest elevation was 

 1972 +20 ft mllw, crest width was 30 ft, and side slopes were 1:2 above 

 mllw and 1:1.5 below mllw. Stone weights, based on 170 pcf, were a 

 minimum of 22 tons for select class "A", a minimum of 12 tons and an 

 average of 17 tons for class "A", and a minimum of 6 tons and an 

 average of 9 tons for class "B". Estimated quantities were 

 66,500 tons of select class "A", 179,300 tons of class "A", 

 184,000 tons of class "B", 69,700 tons of class "C", and 79,500 tons 

 of bedding material. Stone in the armor layer was individually 

 placed by crane. The design wave was a breaking wave varying in 

 height along the Jetty from 18.5 to 27 ft. 



1976 Rehabilitation of the north Jetty was authorized. 



1977_ The outer 500 ft of the north Jetty were repaired. The north Jetty 

 1978 was sand sealed by blasting between stations 46+00 and 66+00. 



The small-boat basin was constructed at South Beach, Oregon, in- 

 cluding two high-tide rubble-mound breakwaters with lengths of 1,800 

 and 700 ft. The breakwaters were designed for a 3-ft wave and a 

 still-water level of +9 ft mllw. Crest elevation was +14 ft mllw 

 with a crest width of 10 ft and side slopes of 1:1.5. The work 

 required an estimated 11,500 cu yd of armor stone, 35,700 cu yd of 

 core and bedding stone for the breakwaters, plus 2,000 cu yd of 

 quarry spalls and 3,000 cu yd of gravel bedding for shore protection. 

 Armor stone weight was between 100 and 1,000 lb, with at least 

 50 percent of the pieces weighing more than 300 lb. 



1983 The outer 360 ft of the north Jetty subsided to below water surface 

 and required major rehabilitation. 



1985 The harbor and cross section of the Jetties are illustrated in Fig- 

 ure 65. The south Jetty shows some damage but is serviceable, and no 

 repairs are planned at this time. Studies are currently being con- 

 ducted for major rehabilitation of the north Jetty. 



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