Table 3 (Continued) 



Date(s) Construction and Rehabilitation History 



1902- Jetties were not (and will not be) maintained and had settled below 



1920 the water surface, up to several feet in places. The majority of 

 (cont.) maintenance work consisted of placing willows and riprap stone bal- 

 last on the Jetties (inner Jetties are implied throughout the bulk of 

 work). The average annual cost for maintaining the Jetties during 

 this period was $75,000. The maintained lengths of the east and west 

 Jetties were 11,170 and 4,710 ft, respectively. 



1921 The outer 4,525-ft length of the east Jetty was protected by con- 

 struction of a heavy stone breakwater at a total cost of $198,000. 

 Additional Jetty maintenance was done at a cost of $62,000. 



1922- About 6,500 ft of the landward end of the east jetty was capped with 

 1926 concrete during 1922-1923. Sections of the east Jetty were repaired 

 using riprap stone capped with concrete during 1924-1926. This work 

 and other minor repairs averaged $17,200 in annual costs. 



1927- A 5,200-ft-long longitudinal dike (willow brush and stone) was con- 

 1929 structed 500 ft east of, and parallel to, an equal landward segment 



of the east Jetty. The purpose of the dike and other features was to 

 halt continued erosion at the landward end of the east Jetty, create 

 a permanent bank (formed by natural deposits) along the seaside of 

 the Jetty, and eliminate future maintenance. During 1928, other 

 major work consisted of raising the outer 4,000 ft of east Jetty up 

 to grade with "large riprap stone" and repairing 3,000 ft of concrete 

 cap by adding concrete and small riprap stone. Total maintenance 

 cost during this period was $203,000. 



1930- The outer 4,300 ft of east Jetty was capped with concrete to an 

 1931 elevation of +5 ft. The existing stone was reset prior to placing 



the 3-ft-wide cap. Additional repairs to the longitudinal dike 



brought the total cost for this period to $41,000. 



1932- No major work was undertaken. The annual cost for continued 

 1938 maintenance of the (inner) Jetties and dike averaged $33,000. 



1939- In 1939 the seaward 5,440 ft of east Jetty was repaired with 

 1949 10,930 tons of stone and 4,420 cu yd of reinforced concrete cap at a 

 total cost of $189,600. The cap was 8 ft wide with a top elevation 

 of +7.5 ft mean gulf level (mgl). In 1940 the outer 4,300 ft of the 

 5,400-ft-long east dike was repaired with willows and stone, and the 

 outer 2,700 ft of the west Jetty was rebuilt with creosoted piles, 

 brush, and stone. Total cost of the repairs was $76,700. In 1941 

 the seaward end of the east jetty was repaired with 1,140 tons of 

 stone at a cost of $9,600. In 1949 the west Jetty was repaired by 

 construction of a treated timber piling curtain wall and stone dike 

 at a total cost of $33,400. 



(Continued) 



21 



