Table 2
Humboldt Bay J e t t i e s
Humboldt Harbor and Bay, C a l i f o r n i a
Date(
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 i n i t i a l c o n s t r u c t i o n o f t h e n o r t h and s o u t h j e t t i e s was
p l e t e d a t t h e s i t e ( F i g u r e 6 ) d u r i n g t h i s time frame. The s o u t h
long with a
j e t t y was 4,000
m l l w c r e s t e l . The
s i d e s l o p e was
2 . 6 5 8 , and t h e c h a n n e l - s i d e s l o p e was
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 a l e n g t h o f 1 , 5 0 0
with a
c r e s t e l o f +12 f t m l l w . The o c e a n - s i d e s l o p e was
and
t h e c h a n n e l - s i d e s l o p e was
S t o n e s used i n t h e j e t t i e s
were composed of rock up t o 8 t o n s i n w e i g h t . The j e t t i e s termi-
n a t e d a t a p p r o x i m a t e l y t h e 18-ft c o n t o u r .
D u r i n g t h i s p e r i o d t h e j e t t i e s d e t e r i o r a t e d from l a c k o f m a i n t e -
1
n a n c e . The c h a n n e l s h o a l e d , and by 1907 t h e o u t e r e n d s o f t h e
j e t t i e s were c o m p l e t e l y b u r i e d i n t h e s a n d o f t h e u n c o n t r o l l e d b a r .
R e c o n s t r u c t i o n of t h e s o u t h j e t t y was i n p r o g r e s s . S t r u c t u r e d e -
191
s i d e s l o p e s w i t h c r e s t e l r a n g i n g from
s i g n c o n s i s t e d of
1915
ft to
f t m l l w . Class I s t o n e s ( 1 0 t o 20 t o n s ) were u s e d
f o r f a c i n g t h e s e a - s i d e s l o p e of t h e o u t e r 2 , 4 0 0 f t o f t h e j e t t y ;
Class
s t o n e s ( 1 t o 10 t o n s ) made up t h e main p a r t o f t h e j e t t y ;
s t o n e s ( 3 t o 500
were u s e d t o l e v e l o f f t h e t o p
and Class
and f i l l i n t h e v o i d s between t h e l a r g e r s t o n e s . A
2 0 - f t - w i d e c o n c r e t e s l a b was p l a c e d on t h e crown.
R e c o n s t r u c t i o n o f t h e n o r t h j e t t y was c o m p l e t e d . The j e t t y was re-
1915
s i d e s l o p e s w i t h t h e f o l l o w i n g classes o f
constructed with
s t o n e s : Class I r o c k s r a n g e d from 6 t o 20 t o n s a v e r a g i n g a t l e a s t
t o 6 t o n s and a v e r a g e d
10 t o n s ; Class
s t o n e s r a n g e d from 500
t o 500 l b . Most
a t l e a s t 1 t o n ; and Class
r o c k s r a n g e d from
s t o n e s were u s e d a t t h e s h o r e w a r d end of t h e
of t h e Class
s t r u c t u r e , t h e p r o p o r t i o n d e c r e a s i n g as t h e j e t t y approached i t s
r o c k s were u s e d f o r t h e j e t t y c o r e , Class
o u t e r e n d . Class
f o r t h e e n r o c k m e n t o v e r t h e c o r e , and Class I a s a f a c i n g f o r t h e
s i d e s l o p e s , t h e l a r g e r p i e c e s b e i n g u s e d on t h e e x p o s e d s i d e of
t h e j e t t y . The t o p was l e v e l e d o f f and a l l v o i d s f i l l e d w i t h small
s t o n e s . The s t r u c t u r e t h e n was capped w i t h a
20- ft-
wide c o n c r e t e s l a b .
The n o r t h and s o u t h j e t t i e s were c o m p l e t e d t o t h e i r p r e s e n t l e n g t h s
( n o r t h j e t t y , 4 , 5 0 0 f t ; s o u t h j e t t y , 5 , 1 0 0 f t ) . The s i d e s l o p e s o f
1927
t h e j e t t i e s were a p p r o x i m a t e l y
( F i g u r e 6 ) with a crest
w i d t h o f 20 f t . The e l o f t h e c r e s t v a r i e d from a b o u t 12 t o 19
m l l w a t t h e seaward e n d . P a r a p e t walls and c o n c r e t e c a p s were i n -
c l u d e d on b o t h j e t t i e s , and mass c o n c r e t e was poured on
s i d e s l o p e s t o s t a b i l i z e armor s t o n e . The p a r a p e t walls were l o c a -
t e d on t h e s o u t h s i d e s o f t h e j e t t i e s and were a b o u t
h i g h and
6 f t wide.
(Continued)
16
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