Fort Pierce Harbor Jetties
Fort Pierce, Florida, SAJ
Construction and Rehabilitation History
Local interests constructed parallel jetties, each 400 ft long and
spaced 600 ft apart, to protect a dredged channel 5 ft deep by 90 ft
wide. About 1925, seas eroded the north beach and flanked the north
jetty, leaving it 200 to 300 ft offshore. In 1926 local interests
started construction of another jetty 400 ft north of, and parallel
to, the south jetty. At the completion of these improvements in
1929, the north and south jetties were 2,300 ft and 1,600 ft, re-
and the channel between the jetties was
240 ft wide and had a controlling depth of 20 ft. The structures
were constructed of native coquina stone with
slopes above - 7 ft mlw.
The district engineer report states that the jetties had settled and
that wave action had created numerous gaps.
The jetties, at that time under Corps jurisdiction, were repaired
using 4- to 10-ton granite stone (Figure 31, inset). Prior to the
repairs the existing side slopes were irregular but approximately
and the alignment of each jetty was irregular. These irregu-
larities were corrected during the repairs. The existing crown
ft mlw. On the north
elevation of the jetties ranged from mlw to
jetty and outer 400 ft of the south jetty, old stone above -1 f t mlw
was removed and placed below this elevation. New stone was placed
ft mlw, a 10-ft crown
along both jetties to a crown elevation of
side slopes. In addition, the south jetty was ex-
tended 420 ft, the crown elevation on the inner 320 ft sloped from
ft mlw to - 5 ft mlw, and the outer 100 ft consisted of a 3-ft-
thick by 40-ft-wide stone apron. The estimated quantities of old
rehandled stone and new stone were 7,500 cu yd and 38,000 tons,
respectively. The water depth at the end of the jetties was approx-
imately -10 ft mlw. The cost of the repair work was 6,000.
The annual report of the Chief of Engineers states, "both jetties
are in good condition."
Presently a 350-ft-wide by 27-ft-deep channel is maintained, running
adjacent to the south jetty. The jetties have not been repaired
since 1934 and are considered to be in good condition.