MECHANICAL DREDGES

Mechanical clamshell dredges are floating platforms that house a heavy-duty cycle crane which uses a wire rope suspended bucket to excavate the sea bottom. During dredging operations, the dredge secures its position by lowering retractable spud poles to the sea bottom. Excavated material is loaded into barges (scows) and transported to a disposal area with the help of a tug boat.

NEW YORK

Coast Guard Inspected

Length: 200 ft (61.0 m)
Breadth: 57 ft (17.4 m)
Depth: 15 ft (4.6 m)
Draft: 7 ft (2.1 m)
Bucket Size: 13 to 24 yd³ (9 to 18 m³)
Bucket Size: 13 to 24 yd³ (9 to 18 m³)
Dig Depth Range: 0 to 65 ft (19.8 m)
Total Installed Power: 3,434 hp (2,562 kW)
Fuel Capacity: 60,000 gal (227,100 l)

G.L. 54

 

Length: 185 ft (56.4 m)
Breadth: 60 ft (18.3 m)
Depth: 11 ft (3.4 m)
Draft: 6 ft (1.8 m)
Bucket Size: 12 to 50 yd³ (9 to 38 m³)
Dig Depth Range: 0 to 150 ft (0 to 45.7 m)
Total Installed Power: 2,340 hp (1,746 kW)
Fuel Capacity: 39,400 gal (149,130 l)

G.L. 55

 

Length: 165 ft (50.3 m)
Breadth: 62 ft (19 m)
Depth: 10.3 ft (3.2 m)
Draft: 6.8 ft (2.1 m)
Bucket Size: 12 to 40 yd³ (9 to 30 m³)
Dig Depth Range: 0 to 150 ft (45.7 m)
Total Installed Power: 1,745 hp (1,302 kW)

NO. 53

Coast Guard Inspected 

Length: 165 ft (50.3 m)
Breadth: 60 ft (18.3 m)
Depth: 10.4 ft (3.1 m)
Draft: 6 ft (1.8 m)
Bucket Size: 10 to 30 yd³ (8 to 27 m³)
Dig Depth Range: 0 to 150 ft (45.7 m)
Total Installed Power: 2,550 hp (1,902 kW)
Fuel Capacity: 100,500 gal (380,390 l)

NO. 58

 Coast Guard Inspected

Length: 140 ft (42.7 m)
Breadth: 72 ft (21.9 m)
Depth: 12.5 ft (3.8 m)
Draft: 10 ft (3.05 m)
Bucket Size: 20 to 50 yd³ (15 to 38 m³)
Dig Depth on Spuds: 78 ft (23.8 m)
Dig Depth on Anchors: 150 ft (45.7 m)
Total Installed Power: 3,000 hp (2,237 kW)
Fuel Capacity: 13,000 gal (49,201 l)

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The Ellis Island

The Ellis Island recently commenced dredging operations on Phase 1 of the MSCIP Comprehensive Barrier Island Restoration Plan in the U. S. Gulf of Mexico offshore of Gulfport Mississippi. With a 15,000 cubic yard capacity Ellis Island is the largest hopper dredge in the U. S..

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