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Viking Marine Services has joined the Brennan Team

J.F. Brennan Company, Inc. is pleased to announce that we have acquired Viking Marine 

Viking Marine
Viking Marine brings over 27 years of quality commercial diving experience and underwater construction expertise. Dave Schlenker and the former Viking Marine crews will be based out of our St. Paul location and will continue to be a go-to resource for utilities, municipalities, and owners of water-based infrastructure. 
The addition of Viking enhances our ability to serve clients with all of their commercial diving needs! 
Our goal is to provide the BEST dive services possible:
Underwater Construction
Underwater Inspections

Same familiar faces and contact information!

Dave Schlenker Dave Schlenker
Regional Dive Manager

office: 651.433.5234
cell: 612.508.8067
644 Bayfield Street
St Paul, MN 55107

Justin Scherf
Underwater Services Director

office: 815.433.5228
cell: 815.979.8973
501 Illinois Ave.
Ottawa, IL 61350

Dive Operations Office
Ottawa, IL
Dive Support Center
La Crosse, WI
Regional Office 
St. Paul, MN


Our goal is to provide the BEST dive services to our clients:

  • Dive Inspections

    • It is often thought that a successful concrete repair must be done in the dry; however, this is not always the case. Brennan can present several methods of underwater concrete placement to best fit each project. – Learn More
  • Underwater Construction

    • J.F. Brennan Company divers are able to repair both concrete and steel underwater structures. Specialty equipment such as underwater saws, torches, and welders enable our trained divers to remove or repair steel structures including pipes, gate structures, trash racks, outfalls, etc. – Learn More
  • Industrial Diving

    • J. F. Brennan Company’s industrial diving services can help your company stay online, preventing costly downtime through preventive maintenance and periodic inspections. – Learn More
  • Salvage

    • Brennan is often called upon by railroads, barge transportation companies, marinas, and municipalities for salvage. – Learn More

Viking Marine Photo Gallery


Download Our Dive Services Brochure

J.F. Brennan Company specializes in marine construction projects throughout the inland waters of the United States.  Download our dive services brochure to learn more about our underwater inspection and underwater construction services.

Click here to download