T a b l e 30
Tillamook Bay
Tillamook, Oregon
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
The n o r t h j e t t y was a u t h o r i z e d t o 5,700 f t .
1912
The n o r t h j e t t y was c o n s t r u c t e d t o 5,400 f t u s i n g 428,672 t o n s of
1917
rock.
The n o r t h j e t t y was r e p a i r e d w i t h 500 t o n s of r o c k p l a c e d n e a r t h e
1921
s h o r e end o f t h e s t r u c t u r e .
The n o r t h j e t t y was r e c o n s t r u c t e d and e x t e n d e d t o t h e f u l l a u t h o r i z e d
l e n g t h of 5,700 f t , r e q u i r i n g 320,350 t o n s o f r o c k .
1933
Minor r e p a i r s were made t o t h e shore end of t h e n o r t h j e t t y .
1946
R e p a i r s were made t o t h e n o r t h j e t t y n e a r t h e shore end. Also, a
1955
breach a t t h e b e a c h l i n e of t h e n o r t h j e t t y t h a t had been c u t t o b r i n g
a beached v e s s e l t h r o u g h t h e j e t t y was r e p a i r e d . R e p a i r work u s e d
5,535 t o n s of rock. A 1955 a e r i a l p h o t o g r a p h of t h e n o r t h j e t t y is
g i v e n i n F i g u r e 62.
The beach was b u i l t up on t h e n o r t h s i d e of t h e j e t t y f o r 3,500 f t .
1962
Seaward of t h e b e a c h l i n e , t h e j e t t y c r e s t was a t h a l f t i d e a n d t h e
o u t e r 800 f t was below t h e low water l e v e l .
The n o r t h j e t t y was r e h a b i l i t a t e d . The j e t t y was raised t o a c r e s t
to
then increased t o
e l e v a t i o n o f +18 f t m l l w from s t a
1965
+24 f t m l l w between s t a
and
and r e m a i n i n g a t +24 f t t o
Design wave f o r t h e r e h a b i l i t a t i o n v a r i e d from a 16.5-ft
sta
b r e a k i n g wave n e a r s h o r e t o a 2 3 . 5 - f t b r e a k i n g wave a t t h e head. The
work r e q u i r e d a n estimated 174,000 t o n s o f class
and
s t o n e , p l u s 60,000 t o n s of s e l e c t class
s t o n e . Select class
had a minimum weight o f 1 t o n s , c l a s s
8
had a minimum w e i g h t of
had a minimum
12 t o n s and a n a v e r a g e w e i g h t of 15 t o n s , and c l a s s
t o n s and a n a v e r a g e w e i g h t of 8 t o n s . A t l e a s t 57 p e r -
w e i g h t of
c e n t of t h e w e i g h t was class
The s o u t h j e t t y was a u t h o r i z e d t o 8,000 f t .
1965
The s o u t h j e t t y was c o n s t r u c t e d t o 3,695 f t . The c o n t r a c t was f o r
c o n s t r u c t i o n of t h e f i r s t 5,000 f t of t h e j e t t y , b u t o v e r r u n s c a u s e d
1971
by s c o u r i n f r o n t o f t h e c o n s t r u c t i o n c a u s e d t h e work t o b e s u s -
pended. The work r e q u i r e d 655,049 t o n s o f s t o n e .
The s o u t h j e t t y was e x t e n d e d by 2,830 f t , r e q u i r i n g 783,944 t o n s of
s t o n e . The d i s t a n c e between t h e n o r t h and s o u t h j e t t i e s was r e d u c e d
1974
from 1,400 f t t o 1,200 f t .
(Continued)
133
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