Dredging
 Donjon provides the in-house equipment, expertise, and personnel to be able to offer turnkey services on maintenance and navigation improvement dredging projects, specializing in both upland and sub-aqueous ocean disposal.
Recognizing the heightening environmental concerns of dredging and ever-tightening industry standards for dredging equipment, Donjon continues to enhance its fleet with newly built and acquired vessels, as well as upgrading its current equipment with state-of-the-art Digital Global Positioning Systems, electronic tide gauges, and federally required and approved environmental buckets.
 Donjon Marine is a recognized leader in dredging, processing and disposal of environmentally sensitive materials in the Northeast. Donjon Marine has also developed and operates a turnkey processing facility and is the only dredging service provider on the East coast capable of environmentally dredging, processing, and disposing of material in-house through the operation of a number of New Jersey-based landfills.
Donjon is ready and willing to tackle any dredging need with a proven track record of prompt, productive, and cost-effective services with a focus on customer satisfaction.
 
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Donjon has a long history in the field of Marine Demolition. From wooden pier removal and disposal to 1000-ton pieces of bridge truss, Donjon has done it all. Donjon has the equipment and experience to handle any marine demolition problem, no matter how complex.
One important component of any turn-key Marine Service provider is Diving. Although Donjon has always provided in-house diving capabilities these services have been in support of its marine salvage related activities. 
Donjon's staff represents more than 200 years of combined experience in marine equipment analysis, design and construction. Expertise acquired during the early years of supplying salvage and marine transportation services provided the basis for Donjon's later diversification into the areas of research, design, and fabrication of various types of structures, equipment and systems.