Riggs Engineering - Civil Engineering - Marine Specialists

Our Projects

Thunder Bay, Ont. - Harbour Dredging

Thunder Bay Port Authority

Thunder Bay, Ont. - Harbour Dredging


The Port of Thunder Bay is a busy commercial harbour with typically 6 million tonnes of grain shipments per year.  Riggs Engineering was retained to address navigation concerns, exacerbated by low Lake Superior water levels. 

Our scope of services included:


  • Pre- and post-dredging surveys;
  • Side scan surveys;
  • Sediment sampling and analysis;
  • Canadian Environmental Assessment Act Screening report;
  • Determination of channel width based on navigation review;
  • Plans and specifications for dredging contract;
  • Contract administration; and
  • Field review services during the project.