Stumpy Point Bay Breakwaters
Stumpy Point Bay, North Carolina, SAW
Construction and Rehabilitation History
Two earthen breakwaters were constructed (Figure 4) in the harbor by
the deposition of 74,200 cu yd of dredged fill reinforced at their
seaward ends by 6,130 tons of riprap and stabilized by the planting
of beach grass, all at a cost of 8,300. The north and south
breakwaters were 875 and 125 ft long, respectively. The breakwaters
provide protection for the harbor area and 10-ft-deep channel en-
trance. The design section (Figure 4, insert) consisted of a 15-ft
ft mlw with side slopes of
crest width at
ft mlw, respectively. The 50- to 1,000-lb riprap
above and below
stone on the seaward end of each breakwater was to be 3 ft thick and
ft mlw. Bedding material was placed to act as
extend from -1 to
a filter layer beneath the riprap.
Visual examination of the breakwaters by the State of
North Carolina Department of Water and Air Resources indicated that
"both breakwaters seemed to be in good shape."
erosion to the breakwaters. It was found that the riprap protected
sections were functioning satisfactorily but that the fill material
adjacent to the riprap sections had substantially eroded. Maximum
vertical scarps of 7, 3, and 3 ft, respectively, were noted on the
bay and harbor sides of the north breakwater and bay side of the
south breakwater. The erosion on the north breakwater was on di-
rectly opposite sides of the breakwater with only 30 ft of original
material separating the narrowest point. It was felt that "the
southeasterly wind with its associated fetch is very erosive to the
breakwaters on both sides of the dredged channel."
Neither repairs nor maintenance has been carried out since the
breakwaters were originally constructed.