Hydrographic Pinnacle Dredging

image of hydrographic Pinnacle dredging in Thebes Illinois


Durocher Marine (2012) Massman Construction (2014)


Thebes, Illinois


  • Bathymetric & Construction Surveys
  • River Navigation Clearance Charting
  • ACOE Experience
  • Familiarity of Mississippi River

2012 – Durocher Marine: Arc Surveying & Mapping, Inc. performed multibeam swath bathymetric surveys at Thebes, IL during December, 2012. The project consisted of locating pinnacles in the river bottom which were hazards to navigation during the extremely low water river levels. Surveys were performed in conjunction with the St. Louis District ACOE and contractors worked together to clear the river channel for shipping.

2014 – Massman Construction: Arc Surveying & Mapping, Inc. performed multibeam swath bathymetric surveys on the Mississippi River between Mile markers 39 to 47 under contract to Massman Construction Company for the St Louis District ACOE. The work consisted of collecting river bottom depths and isolating rock pinnacles protruding above the required river mile design grade.

Surveys were performed daily and provided to the excavator in xyz format for input into the excavator software. Survey data was transmitted to Arc’s Jacksonville, Florida office for daily QC and quantity calculations. Survey data, quantity calculations and maps were provided to the St Louis District daily.