The seaward extension of the west jetty reduced sediment intrusion into the
inlet from the west. Dredging of 53,893 cu yd and the repair and 280-ft landward
extension of the east jetty took place between August-November 1946. Post-
dredging surveys indicate that the west shoal was dredged in its entirety by this
time. The dredging of September November 1946 extended beyond the area of
normal dredging (section A in Figure 2-7), and included a portion of Mattituck
Creek (approximately half of section B in Figure 2-7). However, only the
portion of the east lobe of the flood shoal that encroached in the Federal
navigation channel was dredged. The exposed portion of this lobe, a westward-
directed spit, is not considered to be a part of the flood shoal because it was
formed from landward bypassing. This spit has remained nearly stable from
1950 until present and can be traced to the inlet morphology exhibited in 1891
(Figure 4-10), prior to placement of the jetties.
(a) 8 December 1927
(b) 23 September 1935
(c) 4 May 1936
(d) 3 July 1937
(e) 1938
(f) 1941
Figure 4-25. Shoreline recession and east jetty landward breach 1927 to 1941
137
Chapter 4 Morphology Change, and Channel Shoaling and Migration