DOP Submersible dredge pumps

Maintenance dredging job near Columbia River

PROJECT SUMMARY
Location: Hammond Mooring Basin, Warrenton, Oregon, USA
Period: Q4/2020
Product type: DOP250 with cutter head
Contractor: Bergerson Construction, Inc
Marina maintenance dredging

The City of Warrenton, on the North Pacific US-coast, has a marina on the Columbia River in Hammond, OR.

This marina is one of the most used sport-fishing marinas on the Oregon coast. Yet, it had not been dredged in at least 12 years.

The maintenance dredging job had a tricky start: the water had become so shallow over the years that maneuvering the barge presented a challenge in various areas of the marina.

At low tide, many of the floating docks were too close to the mudline to allow proper dredge access.

The overall dredging job included removing some 44.000 m3 (57.500 CY) of sand and mud, at a maximum dredging depth of -2.5 m (8 ft).

The dredged material was discharged in the flow lane of the Columbia River - during ebb tide only - at a discharge distance of some 450 m (1500 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. This platform was moved around the harbour.