Maintenance Dredging / Rock Removal, Portland Harbor, Maine




Client: US Army Corps of Engineers, New England District
Value: $9,200,000
Project Date: January, 2014 - March, 2014
Project Cut-sheet: Download


This was the first maintenance dredging in Portland Harbor to occur in over 15 years. Crews worked 24 hours a day, seven days a week to complete the project within the environmental work window when dredging could be performed (Nov. 1 - March 15). The project required removal of ~700,000 cubic yards of sediment from the harbor's shipping channel. In addition to maintenance dredging, Cashman drilled and blasted ~1,500 cubic yards of rock.


  • Crews worked 24 / 7 to complete the project, which removed ~700,000 cubic yards of sediment from Portland's shipping channel.
  • Dredging was performed to achieve -37 feet mean lower low water (MLLW).
  • The rock drilling and blasting portion of the project entailed the removal of five rock pinnacles protruding just above the -35 foot MLLW plane, totaling ~1,500 cubic yards.
  • Cashman used the Dale Pyatt, the F.J. Belesimo, and the Kraken to complete the work.
  • Lobster relocation was conducted prior to dredging, requiring close coordination with all parties.
  • Dredged material disposal was in open water at the Portland Disposal Site, ~10 nautical miles away.