Improvements for Masonboro Inlet, North Carolina; Hydraulic Model Investigation. Volume I.
Final rept. Dec 71-May 74,
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MISS
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Masonboro Inlet, located at the southern end of the important resort area of Wrightsville Beach, is a natural channel through the coastal barrier beach of North Carolina that conducts tidal flows between the Atlantic Ocean and a channelized lagoon. The inlet provides passage from the ocean to the Atlantic Intracoastal Waterway and to various private and commercial docking facilities. Improvements for the inlet were authorized in 1949 and included two jetties, an ocean entrance channel between the jetties, and interior bay navigation channels. Initially, the ocean entrance channel was dredged to authorized dimensions of 14 ft deep by 400 ft wide through the ocean bar. Shoaling of this channel occurred, and in 1965 construction of the north jetty on the apparent updrift side of the inlet began. This 3600-ft-long jetty had a 1000-ft-long weir at an elevation of 0 ft msl at its shoreward end. A deposition basin on the lee side of the weir was dredged to contain the sediments passing over the weir the entrance channel was reestablished. After construction, the plan functioned well for a year and a half with the deposition basin filling. However, the entrance channel migrated toward the north jetty structure and cut through the deposition basin in the following years, jeopardizing the structural integrity of both the concrete sheet pile weir and the rock rubble portion of the jetty. To aid in alleviating these problems, the Wilmington District submitted plans to the South Atlantic Division for construction of a south jetty.
- Hydrology, Limnology and Potamology