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: | 15 ft (4.6 m) |
| Bucket Size: | 12 to 25 yd³ (11 to 22.9 m³) |
| Dig Depth Range: | 60 to 83 ft (18.3 to 25.3 m) |
| Total Installed Power: | 3,434 hp (2,561 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: | 8 ft (2.4 m) |
| Bucket Size: | 12 to 50 yd³ (9 to 38 m³) |
| Dig Depth Range: | 74 to 150 ft (22.6 to 45.7 m) |
| Total Installed Power: | 2,340 hp (1,745 kW) |
| Fuel Capacity: | 39,400 gal (149,130 l) |
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) |
| Bucket Size: | 12 to 40 yd³ (9 to 30 m³) |
| Digging Depth: | 90 ft (27.4 m) |
| Total Installed Power: | 1,745 hp (1,301 kW) |
NO. 53
Coast Guard InspectedÂ
| Length: | 165 ft (50.3 m) |
| Breadth: | 60 ft (18.3 m) |
| Depth: | 10 ft (3 m) |
| Draft: | 6 ft (1.8 m) |
| Bucket Size: | 12 to 30 yd³ (9 to 23 m³) |
| Dig Depth Range: | 60Â to 150 ft (18.3 to 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) |
