DOP Submersible dredge pumps

Port of Astoria dredge season started

Location: Astoria West Mooring Basin, Astoria, Oregon, USA
Period: Q1/2021
Product type: DOP250 with cutter head
Contractor: Bergerson Construction, Inc
Marina maintenance dredging

Along the North Pacific US-coast there are plenty of small harbours and marinas. The Port of Astoria is one of them; located on the Columbia River.

This marina not only receives large cruise vessels, but also quite active accommodating fishing boats, commercial and recreational vessels.

The marina off the Columbia River has not been dredged for the past decade.

The current job – removing some 79.500 m3 (100.000 CY) - will be done in three consecutive dredging seasons.

The maximum dredging depth will be -5.5 m (17 ft).

The dredged material is discharged in the flow lane of the Columbia River - during flood tide only - at a discharge distance of some 915 m (3000 ft).

During the dredging activities the DOP250 was mounted on an Deere 470G excavator with long-reach boom and stick. The excavator itself was placed on a sectional barge platform. which was moved around the harbor with a small tug.

The DOP unit was powered via a hydraulic power pack originally designed for a vibratory piledriving hammer. This powerpack was mounted on the counterweight of the excavator.

Real-time control of depth and location was provided with GPS equipment mounted to the excavator and synchronized with DredgePack® software.