Table 24 

 Coquille River 

 Bandon, Oregon 



Date(s) Construction and Rehabilitation History 



1880 The Jetties were authorized. 



1907 Two high-tide, rubble-mound jetties were completed. The north jetty 

 was 3,450 ft long; the south jetty was 2,700 ft long. 



1942 The outer 1,600 ft of the north jetty was rerocked and capped with 



concrete requiring an estimated 55,000 tons of stone and 10,000 cu yd 

 of concrete. The stone was 60 percent class "A", weighing between 1 

 ton and 10 tons with an average of 6 tons, and 40 percent class "B", 

 weighing between 50 lb and 1 ton, with half the class "B" stone 

 weighing over 500 lb. The crest of the concrete cap was at elevation 

 +15 ft mllw, the crest of the jetty was 34 ft wide, and side slopes 

 were 1:1.5. 



1951 A 750-ft shoreward extension was added to the east end of the north 

 Jetty. 



1954 The outer 450 ft of the south jetty was repaired with 30-35,000 tons 

 of stone. Capstones were of an 8-ton average with a 6-ton minimum, 

 and the core was "B" stone over 2 tons, with select "A" stones up to 

 10 tons on the west end slope at the outer end of the jetty. The 

 crest was 20 ft wide at elevation +20 ft mllw, and side slopes were 

 1:2. The design was for an average storm wave height of 10 to 12 ft. 



1956 The north jetty was repaired, including placing concrete under the 



jetty cap in voids caused by erosion of the cap foundation stones and 

 placing jetty stone along the north and south sides of the Jetty cap. 

 Stones were 50 percent class "A", weighing at least 4 tons and aver- 

 aging 6 tons, and 50 percent class "B", weighing at least 1 ton and 

 averaging 2 tons. 



1982 The small-boat basin was constructed at Bandon, Oregon, including 

 construction of a rubble-mound breakwater about 350 ft long with a 

 crest elevation of +14 ft mllw and a crest width of 6 ft. 



1985 The harbor and cross sections of the Jetties are illustrated in 



Figure 55. The head of the north jetty is in need of repair, but it 

 is still functional. The south jetty is in good condition. 



120 



