J.F. Brennan Company

About J.F. Brennan Company

J.F. Brennan Company, Inc. (Brennan) is a fourth-generation, family-owned, marine construction firm that specializes in environmental remediation, dam construction, commercial dive, harbor management, and submarine cable services. Working closely with public and private owners of water-based infrastructure since 1919, Brennan operates throughout coastal and inland waterways nationwide, maintaining a large fleet of marine equipment backed by more than 600 maritime professionals.

Everything Brennan does takes place around the water. As a result, they have the right people, specialized equipment, and proper programs in place to mitigate associated risks. Over the past 100 years, Brennan's quality work and transparent communication with clients have made them a preferred contractor for the US EPA, US Army Corps of Engineers, and private infrastructure owners across the country.

Why Brennan? Safety, quality, and environmental management are long-standing principles within the company, being ISO certified in all three values proves that Brennan objectively maintains the highest of international standards.

Our mission is to create and execute innovative solutions to the world's most complex maritime, environmental, and infrastructure challenges.

Links to share:
Gils in Construction:

100 Year Video:

Brennan on Built To Last - Dresden Underwater Construction:

UW System Career Trek:


Construction Project Manager Intern

May 2020 Rushville, IL
“The construction job it's self was awesome. The experience I have learned from working on a major rehab of a lock is enormous.”

Project Manager Engineer Intern

May 2019 - August 2019 Green Bay, WI
“I really liked working on the water and having everyday be different. One day I could be cruising the river in the morning do get data from a dredge to survey a barge.”
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