outward beneath the
crown width at
side
The
layer
stone size varies from 2 to 18 tons
a
structure may have
range), increasing in 2-ton size increments
successive seaward sections. The cover stone has a unique shape which resem-
a rough surfaced,
flattened cube. The cover stone are placed in
is used on the
except on head sections where a
a single
the cover
toe is buttressed with an additional
1 to
stones of
size
atop the bedding
9. Except for various caps used on the structures,
repairs have
stone. The frequency of repairs was highest
consisted of
the Aransas pass and Brazos
prior to
War 11,
jetties
have been repaired at about the same frequency to the present. The
trend of the repairs has been toward the use of
stone
on
side
Also, the use of concrete on the jetties as a repair
method has been discontinued. The caps have met with mixed success, The
crown has remained reasonably intact,
the
stones have sub-
of the unsupported cap. Re-
sided, causing void spaces and
pairs to
capped sections have been made by adding buttressing and
of the recent
stone or breaking up the cap and adding stone.
repair efforts have concentrated on one side of the structure using the exist-
ing section as a buttress. Repairs at the structures' seaward ends
have consisted of rebuilding the head landward of the original seaward end.
The Port O'Connor and Port
structures were repaired
sea-
ward sections by the addition of
cross sections and have not been
repaired since.
many of the repairs were necessitated by wave-induced damage,
perhaps of
importance has been the scour and undermining at the base of
the structures caused by current- and wave-induced bottom stresses. The jett-
ies at Sabine Pass underwent large amounts of settlement during their
period of construction. Scour appears to have been a contributing factor of
deterioration on the jetties at Aransas Pass, Brazos
Port Mansfield,
, the
Matagorda (during construction), Port O'Connor (prior to
Galveston north jetty, and the Freeport south jetty. Apron stone was added to
jetties within a few years of construction. Spurs were
the Brazos
on the Aransas Pass jetties in 1923, 1956, and 1965. The present con-
ditions of the structures are considered good to
with the exception
9
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