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Have a question or need project support? Brennan can connect you with the right team for marine, environmental, dam, diving, harbor, or energy infrastructure work.

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Connect With Brennan Est. 1919

Brennan works with public agencies, utilities, industrial clients, engineers, contractors, facility owners, ports, terminals, and infrastructure partners across the country. If you are planning a project, looking for a specialized service, or need help determining the right next step, our team is here to point you in the right direction.

For general questions, project inquiries, service requests, or comments, please contact Brennan using the information below.

Main Office

J.F. Brennan Company Main Office
818 Bainbridge Street
La Crosse, WI 54603
(608) 784-7173

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Marine Assistance When You Need It 24-Hour Dispatch

Brennan’s dispatch center is available 24 hours a day, 365 days a year for carriers, terminals, contractors, and marine operators who need assistance.

With one call, Brennan can help coordinate marine support along the Mississippi River, including lock and dam assists, bridge assists, dive teams, barge lightering, salvage, and other marine assistance needs.

24-Hour Dispatch
800-658-9027

Serving Coastal & Inland Waterways Our Locations

Brennan supports fossil fuel, oil, and gas facilities with specialized marine construction, underwater inspection, environmental remediation, and maintenance services. We help facility owners address the complex infrastructure, water access, and environmental challenges that come with operating and maintaining critical industrial assets.

From cooling water systems and traveling water screens to barge terminals, port facilities, pipelines, coal ash ponds, and manufactured gas plant remediation, we deliver safe, efficient solutions tailored to demanding operational environments.

Brennan Locations

J.F. Brennan Company Main

818 Bainbridge Street
La Crosse, WI 54603
(608) 784-7173

Brennan Marine – Burlington

205 Washington Street, Suite 201
Burlington, IA 52601
(319) 208-1185

Dam Construction

2401 W Waukau Avenue
Oshkosh, WI 54904
Phone: (920) 376-7023

Duluth Area

802 Garfield Avenue
Suite 102
Duluth, MN 55802
(218) 349-5237

Eastern Area Dive & Marine Construction

192 Smith Street
North Kingstown, RI 02852
(608) 881-8914

Boston Environmental

125 Church Street, Unit 90-174
Pembroke, MA 02359
(781) 971-5156

Hydrographic Survey

1048 Glory Road
Suite E
Green Bay, WI 54304
(920) 632-6192

Illinois Marine Construction & Dive

501 Illinois Ave
Ottawa, IL 61350
(815) 433-5228

Michigan

7888 Childsdale Ave NE
Suite B
Rockford, MI 49341

Mid-South

6410 Kentucky Dam Road
Paducah, KY 42003
(270) 426-9088

Pacific Northwest

26108 Pioneer Way NW
Poulsbo, WA 98370
(805) 639-2205

Northern California

1805 Railroad Avenue
Winters, CA 95694
(805) 639-2205

Southern California

4411 DuPont Court
Suite 130
Ventura, CA 93003
(805) 639-2205

Southeastern Dive Operations

3380 Chesnee Hwy
Chesnee, SC 29323

St. Louis Operations

300 Humboldt Ave
St. Louis, MO 63147

St. Paul Area

644 Bayfield Street, Suite 220
St. Paul, MN 55107
(651) 224-3007

Not Sure Where To Start? Our Services

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Tell us what you are working on, what challenge you are facing, or what support you need. Brennan will help connect you with the right team.

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Looking for A Career At Brennan? Job Openings

If you are interested in joining Brennan, visit our Careers page to view current openings and learn more about career paths in marine construction, environmental services, commercial diving, harbor operations, professional roles, and internships.

For career-related inquiries, you may also email Brennan’s careers team.

View Job Openings

What Our Customers Are Saying Client Testimonials

Added Value Where Others Do Not

This was my first project with Brennan, and I wish I had met the team 40 years ago. The Brennan team did what they promised, delivered on time, made budgets work, cared about me as a customer, showed great concern for the success of the project, showed loyalty to our combined success, and made me feel valued! They added value where others do not. I would highly recommend Brennan to anyone needing a marine construction project. Ours was very unique, and they could not have been a better group of folks to work with!

Navy Pier Marina

Truly Want To Do What’s Best for the Customer

Brennan just GETS it. They understand inland terminal operations (loading / unloading product barges, fleeting, logistics, dock structures, barge haul systems, demurrage, etc.) and how downtime for a project or emergency repair can significantly impact the owner’s business. It is not often you find a contractor, like Brennan, who can combine this understanding with their own skills, knowledge, and expertise. They truly want to do what is best for the customer.

Consolidated Terminals and Logistics Company

Respected by the USACE

There is no better company on the river. They are respected by the USACE and they do what they say. From a small business perspective, Brennan is the best teaming partner to have.

Togiak Management Services, LLC

On-Time Delivery From Scope To Final Report

Brennan has completed the tasks on time and met all deliverable deadlines, from the scope development through project execution and on-time delivery of the final products survey and report. I will use Brennan without any hesitation in future.

CHA Consulting, Inc.

Planned and Performed Above Expectations

Brennan is an excellent company to work with. Their experience, knowledge and communication skills as a contractor made working with them both enjoyable and valuable to our projects. They planned and performed above expectations, and I look forward to working with them in the future.

Xcel Energy, Inc.

Nothing but Praise for the Team

Brennan was a joy to work with. From the project manager to the field workers, I have nothing but praise for the team. We had two different crews out on-site, and the handoff from one crew to the next was flawless. They made my job easier, and I had full trust in them handling their scope of work. I highly recommend Brennan and will use them for future work.

Lee Mechanical

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