. Case histories of Corps breakwater and jetty structures. Breakwaters; Jetties; Breakwaters; Jetties. Table 29 (Concluded) Date(s) 1981 1983- 1985 Construction and Rehabilitation History 1985 The 2,000-ft extension to the north Jetty and the 2,500-ft extension to the south Jetty were approved. The north Jetty extension included the 600-ft extension authorized in 1958. The Jetties were extended. A 756-ft length of the north Jetty was rehabilitated, and the Jetty was extended 2,500 ft. The south Jetty was extended about 2,300 ft. Four spur "wings", each 100 ft long, were constructed a
. Case histories of Corps breakwater and jetty structures. Breakwaters; Jetties; Breakwaters; Jetties. Table 29 (Concluded) Date(s) 1981 1983- 1985 Construction and Rehabilitation History 1985 The 2,000-ft extension to the north Jetty and the 2,500-ft extension to the south Jetty were approved. The north Jetty extension included the 600-ft extension authorized in 1958. The Jetties were extended. A 756-ft length of the north Jetty was rehabilitated, and the Jetty was extended 2,500 ft. The south Jetty was extended about 2,300 ft. Four spur "wings", each 100 ft long, were constructed at a 45-deg angle near the end of each Jetty. The project required 1,300,000 tons of rock. Crest elevations of the ex- tensions were +18 ft rallw, except for the seaward 300 ft of the north Jetty and the seaward 500 ft of the south Jetty, which had crest ele- vations of +20 ft mllw. Crest elevation of the spurs varied from +18 ft to +14 ft mllw. The top width of the extensions was 34 ft, and the side slopes were 1:2 above rallw and 1 below mllw. Armor layer thickness was typically 14 ft on the extensions, using class "A" stone weighing between and tons and averaging 15 tons. Select class "A" stone weighing a minimum of 19 tons was used for the armor layer near the end of each extension. Stone weights were based on a unit weight of 165 pcf. The harbor and cross sections of the jetties are illustrated in Figure 61. Both jetties are in good condition at this Figure 60. Aerial photograph of Jetties at Siuslaw River, Oregon, 1969 131. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ward, Donald L. (Donald Leslie), 1943-; U. S. Army Engineer Waterways Experiment Station; Coastal Engineering Research Center (U. S. ); United States. Army. Corps of Engineers; Repair, Evaluation
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