• Energy Services

    At Brennan, we provide quality above- and below-water marine construction, barge transportation, and environmental remediation services to the energy industry. We work closely with our clients, their engineers, and all stakeholders to deliver innovative solutions to their biggest challenges.

    Areas of Expertise

    • Marine Construction
    • Fossil Fuels
    • Harbor Services
    • Hydroelectric Dams
    • Nuclear Generation Facilities
    • Transmission & Distribution
    • Environmental Remediation
    • Maritime Security Barriers
    • Underwater Inspections & Survey

  • Environmental Services

    At Brennan, we believe that restoring and protecting marine ecosystems is engrained in the ethical fabric of our company.

    Our environmental services combine decades of field-tested expertise, innovative technologies, and rigorous safety and compliance standards. Whether it’s remediating contaminated sediments, rehabilitating wetlands, or addressing sites of concern, we deliver lasting results through collaboration and precise execution.

    Areas of Expertise

    • Environmental Dredging
    • Habitat Restoration
    • Isolation Barriers
    • Sand Covers and Capping
    • Environmental Restoration
    • Dredged Material Dewatering Services

  • Marine Construction

    Founded along the banks of the Mississippi River, Brennan has been working in and along the inland waterways since 1919. Our abilities include above and below-water construction, repair, and inspection services on a wide variety of structures. With a large fleet of specialty marine equipment, we can operate in bodies of water that range from small ponds to oceans.

    Areas of Expertise

    • Acoustic Imaging
    • Bridge Construction and Replacement
    • Hydrographic Survey
    • Side Scan Sonar
    • Hydrographic Survey
    • Dock and Barge Terminal
    • Construction
    • Maritime Security Barriers
    • Submarine Cable
    • Railroad

  • Dam Construction

    At J.F. Brennan Company, our teams have the experience necessary to work in all types of conditions, including confined spaces, elevated workstations, underwater construction, and more. When most firms pursue dam work as a secondary focus, we have made it a primary focus.

    Areas of Expertise

    • Intakes and Headworks
    • Cofferdams
    • Concrete Placement & Repairs
    • Gate and Actuators
    • Grouting
    • Leave-in-Place Formwork
    • Hydropower
    • Precast Components

  • Harbor Services

    We provide inland harbor services for utility companies, dry bulk terminals, and specialty large bulk shippers along the Mississippi River, providing dependable barge transportation for the safe transport of grain, salt, coal, cement, fertilizer, pig iron, asphalt, and oversized mechanical components.

    Areas of Expertise

    • Short Haul Towing
    • Switching and Fleeting
    • Harbor Support
    • Vessel Management

  • Submarine Cable Services

    For more than 100 years, we have provided quality above- and below-water construction services on all types of marine-based infrastructure. Our reputation as an innovative contractor who stresses the importance of safety and environmental awareness makes us a preferred partner for many private- and public-sector clients. We’ve taken our century of marine construction experience along with our core principles and incorporated them into the bedrock of our Submarine Cable team.

    Areas of Expertise

    • Strategic Staging and Support Locations
    • Shore-End Civil and Site Work
    • Route Preparation
    • Pre-Lay Grapnel Runs
    • Submarine Cable Installation
    • Post-Lay Cable Protection
    • Submarine Cable Inspection
    • Cable Repair and Maintenance
    • Submarine Cable Removal
    • Environmental Preservation
    • Permit Support

  • Dive Services

    Our teams are trained to the highest standard, utilizing the newest technologies in underwater services to accomplish difficult tasks in near zero-visibility, through a combination of underwater survey and ROVs. We specialize in inland waterway and wastewater to provide excellent and experienced diving services to fit your needs.

    Areas of Expertise

    • Dive Inspections
    • ROV
    • Underwater Construction
    • Underwater Inspections & Surveys