USA: Corps Unveils Portsmouth Harbor Dredging Plan

The U.S. Army Corps of Engineers, New England District is soliciting contractors for maintenance dredging at Portsmouth Harbor and Piscataqua River in ME and NH.

The project is planned to be issued in on or about 20 August 2012. The construction window for dredging activities is between December 1, 2012 and March 15, 2013. The estimated construction cost is between $500,000 and $1,000,000.

The project involves maintenance dredging and advance maintenance dredging to remove a total of about 15,000 cubic yards of sand and gravel from the authorized 35 foot deep channel in the Piscataqua River. The work involves removal of 3 distinct, relatively small shoal areas within the Simplex Reach.

Advance maintenance dredging to -40′ Mean Lower Low Water (MLLW) plus 2′ allowable over-depth dredging will be performed on the primary shoal located adjacent to the Tyco Integrated Systems Company wharf (i.e. formerly the Simplex Wire and Cable Co. dock).

Maintenance dredging to -35′ MLLW plus 2′ of allowable over-depth (i.e. 37′ below MLLW) will be performed on the other two shoals; one located upstream of the primary shoal and one located downstream of the primary shoal. The dredged material will be placed at a previously-used, in-river disposal area, located about 3,000′ seaward of the dredging area.

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Press Release, November 16, 2012