Mechanical Dredges

EQUIPMENT

Mechanical Dredges

GLDD operates four of the largest mechanical clamshell dredges in the United States, as well as a barge mounted Liebherr 996 hydraulic excavator. These vessels operate on large load line certified spud barges and are utilized on a wide range of projects, including navigation channel and port facility improvements, maintenance dredging, demolition, pipeline excavation/burial, and slope revetment works. The dredges are capable of excavating a wide range of material. Dredged material is typically loaded into barges (scows), which transport the material to its final in-water or upland placement site. GLDD owns and operates a large fleet of material transport barges, a hydraulic barge unloader, and a drilling and blasting barge (drillboat) to support its mechanical dredging operations.

New York

Coast Guard Inspected

Length: 200 ft (61.0 m)
Breadth: 57 ft (17.4 m)
Depth: 15 ft (4.6 m)
Draft: 15 ft (4.6 m)
Bucket Size: 12 to 25 yd³ (11 to 22.9 m³)

PERFORMANCE

Dig Depth: 75 ft

TOTAL INSTALLED POWER

3,434 hp (2,561 kW)

G.L. 54

Length: 185 ft (56.4 m)
Breadth: 60 ft (18.3 m)
Depth: 11 ft (3.4 m)
Draft: 8 ft (2.4 m)

PERFORMANCE

Bucket Size: 12 to 50 yd³ (9 to 38 m³)
Dig Depth: 150 ft

TOTAL INSTALLED POWER

2,340 hp (1,745 kW)

G.L. 55

Length: 158 ft (48.2 m)
Breadth: 62 ft (19 m)
Depth: 10.3 ft (3.1 m)
Draft: 6.8 ft (2.1 m)

PERFORMANCE

Bucket Size: 12 to 40 yd³ (9 to 30 m³)
Digging Depth: 90 ft (27.4 m)

TOTAL INSTALLED POWER

Total Installed Power: 1,745 hp (1,301 kW)

No. 53

Coast Guard Inspected

Length: 165 ft (50.3 m)
Breadth: 60 ft (18.3 m)
Depth: 10 ft (3 m)
Draft: 6 ft (1.8 m)

PERFORMANCE

Bucket Size: 12 to 30 yd³ (9 to 23 m³)
Dig Depth: 150 ft

TOTAL INSTALLED POWER

2,550 hp (1,902 kW)

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)

PERFORMANCE

Bucket Size: 20 to 50 yd³ (15 to 38 m³)
Dig Depth on Spuds: 78 ft (23.8 m)
Dig Depth: 150 ft

TOTAL INSTALLED POWER

3,000 hp (2,237 kW)

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Mechanical Dredges

EQUIPMENT