Table 3
Period of Modern Structures
Date
Description
1939
Dual rubble-mound jetties completed.
1939
Entrance Channel completed (30 ft deep - 500 ft wide).
1939
Eureka, Samoa, Arcata, Fields Landing Channels initial construction completed.
1954
Entrance Channel deepening completed (40 ft).
Eureka and Samoa Channels deepening (to 30 ft) completed and North Bay
1954
Channel initial construction completed.
1959
Engineering and design study; Repair on north and south jetty.
1960-63
Repair damage of winter of 1957-58.
1964-65
Extreme damage to jetties (100-ton blocks washed away).
1966-67
Repair and maintenance on north and south jetty.
1969
Jetty repair study and model conducted by ERDC in Vicksburg, MS.
1971-73
Dolosse placed on jetties, heads had been completely destroyed.
1977
USACE names jetties a historical civil engineering landmark.
Dredging for both channel improvements and maintenance has been an
ongoing process from the first Humboldt Bay navigation improvement project.
The Entrance Channel now receives most of the attention for maintenance
dredging, and the volumes and frequency are indicative of the stability and
dynamic behavior of the inlet and its role in the littoral processes. However, the
North Bay Channel and Fields Landing Channel have also undergone substantial
maintenance dredging because of their close proximity to the entrance. Table 4
is a chronology of the maintenance dredging for the bar and entrance channel.
It is hypothesized that future maintenance dredging at the bar and entrance
channel, and at the North Bay Channel will decrease in response to the recent
deepening project because of decreased shoaling rates. This projection is based
on model predictions as reported in the feasibility study for the project.
Chronology of Key Studies
Few studies have been done on the physical oceanography of Humboldt Bay,
the inlet dynamics, sediments and sedimentation in the bay, and the behavior of
the littoral cell. The chronology of each of the key studies done for each of these
topics is listed in Tables 4-7. Additional information on the specific references is
provided in "Studies and Reports" section of Chapter 4.
13
Chapter 3 Chronologies of Inlet Development
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