Spotlight on Napa River maintenance dredging

Infrastructure

Pacific Dredge & Construction (PDC) has won the Napa River Maintenance Dredging project by the U.S. Army Corps of Engineers.

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The project goal was to make the river deeper back to its original navigational depths, allowing boats to always transit fully throughout the river.

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The last time the Napa River was dredged was in 2016, and it was performed hydraulically.

The scope of work for this maintenance dredging period restricted dredging to a clamshell method only and upland disposal.

To perform this project, Pacific Dredge & Construction used the smaller rig “Horton”, in conjunction with the 300 cu yds scows Thing 1 and Thing 2 along with the In-Harbor tugboat named Cadet.

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A subcontractor was hired to perform the upland offloading portion of the project with an E-Crane barge and earth-moving equipment. In conjunction, the County of Napa offered a disposal site to be used for offloading dredged materials and hired a subcontractor to off-haul sediments to their destination.

The dredged material was taken by scows to the temporary off-loading disposal site.

The river is also divided into three Reaches 1, 2, and 3 where working hours are different as the project is conscious of the proximity to commercial & residential properties to minimize disturbance to all of them.