Figure 4-28. Federal navigation channel and Federal anchorage
dredging areas, September October 1965
Figures 4-29a through 4-29l show Mattituck Inlet at different times from
1930 to April 2004. Figure 4-29d shows Mattituck Inlet on 11 May 1955,
immediately prior to a maintenance dredging. According to the conditions
surveys of 1946 and 1950, sediment dredged during these periods was placed to
nourish the beach east of Mattituck Inlet. The 1955 aerial photograph indicates
that width of the beach directly adjacent to the east jetty had increased by
approximately 50 ft (as compared to 1941).
The migration of the attached formation from 1941 to present can be seen in
this series of figures. The formation appears to have begun migrating after 1950,
apparently in response to the prior jetty modifications. The post-dredging survey
of 7-8 November 1950 shows the now-truncated formation to be oriented
perpendicular to the east jetty and generally oriented along an east-west axis, as it
was in 1941. The orientation of this formation in 1976 and thereafter is
approximately along a north-south axis. Subsequent aerial photographs show
that this formation continued to migrate further into the inlet. Waves and the
flood current are presumed to have caused this formation to migrate, and because
much of this formation presently lies below mlw, it can now be considered to be
a flood shoal.
The morphology of Mattituck Inlet on 16 April 2003, 11 months prior to the
recent dredging of 17-24 March 2004, is shown in Figure 4-29k. Figure 4-29l
shows the morphology of Mattituck Inlet on 15 April 2004, immediately after
this dredging.
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Chapter 4 Morphology Change, and Channel Shoaling and Migration
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