T a b l e 29 (Concluded)
C o n s t r u c t i o n and R e h a b i l i t a t i o n H i s t o r y
Date(
1981
The 2 , 0 0 0 - f t e x t e n s i o n t o t h e n o r t h j e t t y and t h e 2 , 5 0 0 - f t e x t e n s i o n
t o t h e s o u t h j e t t y were a p p r o v e d . The n o r t h j e t t y e x t e n s i o n i n c l u d e d
t h e 6 0 0 - f t e x t e n s i o n a u t h o r i z e d i n 1958.
The j e t t i e s were e x t e n d e d . A 7 5 6 - f t l e n g t h of t h e n o r t h j e t t y was
1983-
r e h a b i l i t a t e d , and t h e j e t t y was e x t e n d e d 2,500 f t . The s o u t h j e t t y
1985
was e x t e n d e d a b o u t 2 , 3 0 0 f t . Four s p u r
each 100 f t l o n g ,
were c o n s t r u c t e d a t a 45-deg a n g l e n e a r t h e end of each j e t t y . The
p r o j e c t r e q u i r e d 1,300,000 t o n s of rock. Crest e l e v a t i o n s o f t h e ex-
t e n s i o n s were +18
m l l w , e x c e p t f o r t h e seaward 300 f t of t h e n o r t h
of t h e s o u t h j e t t y , which had c r e s t ele-
j e t t y and t h e seaward 500
v a t i o n s of +20 f t m l l w . Crest e l e v a t i o n of t h e s p u r s v a r i e d from
f t m l l w . The t o p w i d t h of t h e e x t e n s i o n s was 34 f t ,
+18 f t t o
and t h e s i d e s l o p e s were 1:2 above m l l w and
below m l l w . Armor
l a y e r t h i c k n e s s was t y p i c a l l y 14
on t h e e x t e n s i o n s , u s i n g c l a s s
s t o n e weighing between 11.5 and 18.9 t o n s and a v e r a g i n g 15 t o n s .
s t o n e weighing a minimum o f
t o n s was u s e d f o r t h e
S e l e c t class
armor l a y e r n e a r t h e end o f each e x t e n s i o n .
S t o n e w e i g h t s were based
on a u n i t w e i g h t of 165 p c f .
The harbor and cross s e c t i o n s of t h e j e t t i e s are i l l u s t r a t e d i n
1985
Aerial p h o t o g r a p h of j e t t i e s a t S i u s l a w R i v e r , Oregon, 1969
F i g u r e 60.
131
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