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concrete placement, dam construction, hydroelectric dam construction, Midwest dam construction, dam construction contractor, mass pour

Mass Pours

Our ability to provide turnkey, time critical dam construction services will ensure that your projects stays on schedule and result in the highest quality possible. Throughout the project we create a collaborative environment with the owner and its representative engineer to ensure that work is carried out in the most efficient way.

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concrete repairs, dam construction, dam repairs, cofferdams, gate repairs, embedded metals, roller gate repairs, mississippi river construction

Concrete Repairs

Our experienced crew members have the tools and expertise to perform above and below-water quality concrete repairs. We specialize in accessing remote locations and working safely around hazardous conditions. Using our specialty repair services you may be able to avoid the added cost of a cofferdam, and truncate the required schedule to complete the project.

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dam construction, dam repairs, precast concrete repairs, fish protection, hydroelectric dams, dam contractors

Precast Components

Precast components can be a cost effective solution to replacing key pieces that experience high wear. This includes fish screens, pier noses, bulkhead slots, and other components that commonly include embedded metals. The precast option allows for a high level of quality control as pieces are premade and then anchored and grouted into place in above and below water locations.

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preplaced aggregate concrete, dam construction, dam repairs, concrete repairs, underwater concrete repairs, hydroelectric dam repairs, hydro dam repairs

Preplaced Aggregate Concrete

Brennan is one of the only contractors in the country that can provide a high quality preplaced aggregate concrete repair. This method of placement is one of the most effective ways to repair surfaces both above and below the waterline. Aggregate is placed into the formwork, followed by a high tensile strength grout, resulting in a long-lasting, robust repair.

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dam construction, dam repairs, concrete repairs, grouting, grouting programs, penstock repairs


Above and below water grouting is one of our specialties. Grouting is used to consolidate degraded structures and embankments. It’s a cost effective way to stop leaks, fill voids, and shore up critical infrastructure.

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vinyl sheet piling, leave in place formwork, concrete protection, dam construction, dam repairs, midwest dam repairs, dam contractors

Leave in Place Formwork

Vinyl sheeting can play a dual purpose of protecting the underlying concrete degradation caused by seasonal freeze-thaw cycles, and provides an aesthetically pleasing result. This method is cost effective as it does not require heavy equipment, and can be carried out both above and below the waterline.

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More Information dam construction careers, marine construction careers, midwest construction careers

Download our Dam Construction Brochure

J.F. Brennan Company specializes in dam construction and repairs services both above and below the waterline. Download our brochure here to learn more about our dam construction services!


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Careers dam construction careers, marine construction careers

Do You Have What it Takes!?

At Brennan, we are always looking for individuals who have a passion for working around the water.  If you are looking for a rewarding career with daily challenges, then click here!

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