PART 11: SUMMARY OF CORPS BREAKWATER AND JETTY STRUCTURES IN
maintains 1 coastal projects which contain a
2
total of breakwaters and 19 jetties. These projects are located within US
Galveston
which includes the entire Texas
eight projects located directly on the gulf and the
Port
project contain dual jetties; the Palacios and Port Aransas
Harbor projects contain dual breakwaters; and the Point Bolivar project has a
single jetty.
4. Cumulative length of the structures is 176,333 lin
of which the
Galveston Harbor and Sabine Pass jetties account for 61.4 percent and the two
breakwater projects account for 2.4 percent. A originally constructed, about
s
170,177 lin ft (96.5 percent) had a rubble-mound cross section and the re-
mainder--6,165 lin ft at point Bolivar and Port
essentially a
steel-sheet-pile structure. Approximately 3,230
ft of sheetpiling has
since been supplemented with a rubble-mound section, and nearly 62,900 lin ft
of the structures have been capped with asphalt or concrete although the
present amount is somewhat less due to subsequent alterations. The asphalt
capping, totaling 3,944 lin ft, was placed at four sections of the
Harbor jetties during the
5. The five projects at Sabine Pass, Galveston, Freeport, Aransas Pass,
and Brazos Island have a history predating 1900. These early projects were
marked by various construction methods and extended time periods resulting
several factors, including availability of materials, inadequate design
guidance, storm damage, economics, and the construction methods themselves.
Fascine mats ballasted with riprap stone were the prevalent early method of
construction. This type of construction was used at Sabine Pass into the
The
but was discontinued on the remaining projects prior to
resulting construction method consisted of building a rubble-mound section
directly on existing ground, starting with small riprap stone, building up the
section with a core of various sized riprap stone (laterally confined by prior
placement of larger cover slope stone), and covering with granite pieces
weighing several tons each. The project at Brazos Island was finally realized
*
table of factors for converting non-SI units of measurement to SI (metric)
A
units is presented on page 3 .
6
Previous Page
