FY22 Brunswick Inner Harbor Maintenance Dredging

The Brunswick Inner Harbor Contract provides construction services, including furnishing personnel, transportation, mobilization and demobilization, equipment and materials required in connection with maintenance dredging.  This contract is traditionally performed with a hydraulic cutterhead dredge and the duration is expected to be three months from time of award.  Up to 500 thousand cubic yards of maintenance material is expected to be removed from the inner harbors.

The work is located in Brunswick Harbor Georgia deep draft navigation projects.  Brunswick Harbor is located 70 statute miles south of the Savannah Harbor, Georgia, and 25 statute miles north of Fernandina Harbor, Florida (FL), in Glynn County, Georgia.  Brunswick Harbor Inner Harbor channel is 36 ft. deep MLLW and 400 ft. wide through St. Simon Sound, Brunswick River, Turtle River, South Brunswick River, and East River.

Brunswick Harbor Inner Harbor is generally dredged in late summer or fall and takes approximately two months to complete.  The dredging in the Brunswick Inner Harbor primarily takes place annually in the East River which includes the East River Turning Basin and the Transition Areas (stations 0+000 to 12+000) leading up to the turning basin and immediately upriver of the basin.  The South Brunswick River (stations 0+000 to 7+000) in the Brunswick Inner Harbor is the other area that may requires dredging and is primarily dredged when shoaling become problematic to navigation but is constantly monitored monthly.  The Lower Turtle River (station 35+000 to 36+000) in the Brunswick Inner Harbor is another area that may requires dredging and is primarily dredged when shoaling become problematic to navigation but is constantly monitored monthly.  Approximately 295,000 cubic yards of material is removed from the East River annually, approximately 20,000 cubic yards of material is removed from the South Brunswick River and approximately 300 cubic yards  from Lower Turtle River when dredged.  The maintenance material removed from the Brunswick Inner Harbor is placed in the Andrews Island Dredged Material Containment Area located adjacent to both the East River and the South Brunswick River.  Andrews Island is the only confined upland containment area in the Brunswick Inner Harbor.

Advanced maintenance depths and locations for Brunswick Inner Harbor is as follows:

East River, 0+000 to 2+500 project depth is 36’ with 1’ of advanced maintenance

East River, 2+500 to 4+500 project depth is 36’ with 5’ of advanced maintenance

East River, 4+500 to 6+250 project depth is 36’ with 1’ of advanced maintenance

East River, Turning Basin project depth is 36’ with 1’ of advanced maintenance

Environmental windows limit the timing of dredging in the Brunswick Inner Harbors.  Environmental restrictions on the Brunswick Inner Harbor include a Least Tern nesting window to where dredged material must not be placed in the Andrews Island confined upland disposal area between the middle of April through the middle of August.

Awarded contract W912HN22C5005 to SOUTHERN DREDGING CO., INC. for 2420985.00 on 2022-07-29.