Period of Modern Structures

Period of Discovery

Summary of Maintenance Dredging in Bar and Entrance Channel

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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.

Chapter 3 Chronologies of Inlet Development

Index

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