J.F. Brennan
Family-owned US marine contractor from La Crosse, Wisconsin, providing marine construction, commercial diving, dredging, dam, harbor and energy infrastructure services.
La Crosse, WI · Service Provider
About
Brennan traces its origins to 1919, when brothers Gene and Jim Brennan formed Brennan Brothers Construction in northeast Iowa, building on earlier concrete, sawmill, agricultural and bridge work. The business moved into river-based construction and was incorporated as J.F. Brennan Company in La Crosse, Wisconsin in 1959, where it remains headquartered.
The company is fourth-generation and family-owned. Its management systems are audited by BSI and certified to ISO 9001, ISO 14001 and ISO 45001, and it is approved to perform nuclear safety-related work under ASME NQA-1 (2022), 10 CFR 50 Appendix B and 10 CFR Part 21. Brennan acquired Harbor Offshore, Inc., the first company licensed by the US Navy to reproduce its waterside perimeter barrier system for commercial use.
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