WSP06362

• File Number: 8210.470
• Description: Pacific Southwest Interagency Committee
• State: CO
• Basin: Colorado Mainstem
• Water Division: 5
• Date: 11/1/1971
• Author: PSIAC
• Title: Pacific Southwest Analytical Summary Report on Water and Land Resources based on Framework Studies of Four Regions - November 1971
• Water Supply Pro - Doc Type: Report/Study

OD269~

for navigation. The operation of Shasta Dam is
required to provide a minimum depth of 6 feet for
navigation on Sacramento River between Colusa and
Sacramento. However, releases for other project
purposes generally meet this minimum flow
requirement.

Needs and Problems - Commercial Navigation

The needs for commercial navigation are defined
in terms of waterborne commerce tonnage.

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Figure 30.-Summary of waterborne commerce, by
type of commodity.

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Figure 31.-Summary of waterborne commerce, by
type of traffic.

Navigation

Projections, by type of commodities and traffic,
made for the major ports and terminals in the Region
are shown on ligures 30 and 31. Figure 30 shows
petroleum and petroleum products wili represent
about 60 percent of the Region's total waterborne
commerce in the year 2020. Figure 31 shows a
pronounced growth in foreign traffic, particularly
foreign imports.
Projections indicate that the Region's two major
port complexes - San Francisco Bay, and Los
Angeles-Long Beach harbors - will handle about 31>
times more tonnage in 2020 than in 1965. The
Region's other harbors will handle about 21> times
more tonnage than in 1965. Radical changes in vessel
design and cargo-handling techniques have made
many existing waterways and port facilities obsolete.
The future deep-draft petroleum tankers and dry-bulk
carriers, and container-ships, require major
modification of the commercial navigation facilities.
Existing navigation channels and basins require
deepening, widening, and, in some instances,
extending to accommodate larger vessels. Major
expansion of needed dockside facilities requires
additional land areas and a substantial investment in
modern terminal and transfer facilities. The
specialized bulk-loading and container-handling
terminals require far greater acreages of backup land
per ship position than do the conventional, general
cargo berths.
The 1965 commerce and projected cumulative
needs for commercial navigation measured in terms of
tons of waterborne commerce are:

1965 1980 2000 2020
(Million short tons)

99

154

228

323

Plan Response - Commercial Navigation

The future requirements for waterways and
tenninal facilities are projected on the assumptions
that: (1) the trend toward major regional ports,
rather than small local ports, continues; (2) present
trends toward sophisticated cargo-handling
techniques, such as containerization and bulk
handling of cargo, continue; (3) present trends
toward deep-draft supertankers continue and that a
supertanker with a draft of 70 feet enters the major
ports; and (4) conventional monohull ships continue
to handle the majority of the cargo. It was further
assumed that projected waterborne commerce
tonnage would be handled in the most efficient
manner possible.
The proposed means to satisfy future commercial
navigation needs are generally based upon
conventional improvement of existing facilities.

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