Table 27
Mission Bay Jetties
Mission Bay Harbor, California
Date(
Construction and Rehabilitation History
1949
Construction of three rubble-mound jetties at the site (Fi
was completed. These structures included a 3,300-ft-long
jetty, a 4,270-ft-long middle jetty, and a 950-ft-long sou
Typically, the jetties were built with a 16-ft-wide crest
of +14 ft mllw with side slopes of
1955
Sediment from the littoral zone was noted passing through
jetty into the entrance channel. Sealing stones (3,000to
placed on the seaward slope of the jetty. This measure re
the movement of sand but did not entirely stop infiltratio
1959
Approximately 1,300 ft of the middle jetty and 1,000 ft of
north jetty were sealed with grout to prevent the movement
ment through the structures. The original core stone of
ties was constructed at el 0.0 ft mllw. The intruded grou
was installed to el
ft mllw. The cost of this work was
A 1,100-ft-long extension and sealing of the south jetty w
1970
pleted. Jetty sealing was accomplished by installing a
of sealing stone in the littoral zone. The head of the mi
jetty also was repaired in that the cover stone (12-ton) a
head of the jetty was restored. Total cost of the work wa
6,000.
1986
The existing jetties currently are in satisfactory conditi
Design has been completed for an offshore breakwater
ward of the north and middle jetties that will provide add
wave protection for Mission Bay Harbor. The proposed offs
breakwater has been model tested (Curren 1983, Markle 1983
and Acuff 1985) but not yet constructed in the prototype.
57
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