Piscataqua River Dredge

Great Lakes Dock and Dredge, Inc. will be conducting maintenance and improvement dredging in Portsmouth Harbor and Piscataqua River, Newington, New Hampshire and Eliot, Maine starting 1 November 2021 to 1 April 2023. 

Operations will be conducted 24 hours a day, 7 days a week, and transiting the dredged material south to Nantasket Beach as well as to the Isle of Shoals North disposal site.  The attached haul route shows the width of the approved route.  Fishermen should remove gear from the haul route immediately.  Maine DMR works with the US Army Corps of Engineers (USACE) to provide notice to fishermen of these routes, but did not receive final confirmation of this route until today.  According to the USACE, dredging will begin on or about Nov 16th – the initial material SHOULD be going to MA nearshore sites BUT there is a possibility they may have some material would need to go to IOSN.  Blasting will begin in December, with all of that material going to IOSN. 

Equipment on scene will be the Dredge NEW YORK, Dredge 55, Drill boat APACHE, Crane #1, 2 – 500’s Scows & 2 – 600’s scows, Tug boats TBD, Survey Vessel WOLF RIVER, Crew Boat SAGINAW RIVER.   Vessels will be monitoring VHF-FM Channels 13 and 16. Mariners are urged to transit at their slowest safe speed to minimize wake and proceed with caution after passing arrangements have been made. 

The project consists of the expansion of the 35 Foot Turning Basin located on the Piscataqua River near Porstmouth, NH. A total of 677,100 CY of new work sand/clay/glacial till material along with 14,700 CY of Rock shall be removed by mechanical dredge and disposed of at various locations including offshore, nearshore, or pumped out onto Nantasket Beach, MA. Project grade for the Turning Basin shall be -35’ +2’ in “Ordinary” non-rock material, and 37’ +2’ MLLW in a defined Rock area. The Base work involves the dredging of the full quantity 691,800 CY of new work ordinary material and rock at the Isles of Shoals North (IOS-N) Offshore Disposal Site.

GLDD’s point of contact is Johan VanBladel, (630) 235-9612.  If gear is lost, please contact Mr. VanBladel or your local Marine Patrol officer for more information.

To see or print this chart, CLICK HERE

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