Specialized Construction, Rehabilitation, and Repair for Critical Dam Infrastructure
Brennan builds, repairs, and improves dams, locks, hydroelectric facilities, and water-control structures with marine crews, divers, equipment, and safety-focused execution.
Built for Complex Work Above & Below the Waterline Est. 1919
Dam projects demand specialized planning, precise execution, and a deep understanding of water control, structural systems, underwater conditions, mechanical components, confined access, and active operating environments.
Brennan is built for that complexity. Our crews work above, below, and within dam structures to support construction, rehabilitation, inspection, repair, and long-term performance. With more than a century of experience working in and around the water, Brennan understands the risks, constraints, and coordination required to complete dam work safely and effectively.
Whether supporting a US Army Corps of Engineers lock and dam project, rehabilitating hydroelectric infrastructure, improving fish passage, or repairing critical concrete and mechanical systems, Brennan brings the field-proven expertise to move the work forward.
Specialized Support for Dams, Locks, Hydropower, and Water-Control Structures Dam Construction Services
Brennan provides dam construction and rehabilitation services across the full project lifecycle, from planning and access to construction, underwater inspection, repair, replacement, and long-term infrastructure support.
Lock & Dam Construction & Rehabilitation for USACE Projects Locks & Dams
Brennan supports US Army Corps of Engineers operated lock and dam projects with specialized marine construction, concrete repair, cofferdam, dewatering, diving, mechanical, and structural capabilities. We understand the demands of working on critical navigation and water-control infrastructure, where safety, scheduling, access, river conditions, and operational continuity all matter.
From lock chamber repairs and dam rehabilitation to underwater inspections, structural improvements, and temporary works, Brennan brings the equipment, crews, and project discipline needed for complex federal infrastructure work.
Key Capabilities
- Lock and dam construction
- Lock chamber repairs
- Dam rehabilitation
- US Army Corps of Engineers project support
- Cofferdams and dewatering
- Concrete placement and repair
- Underwater inspections and repairs
- Structural steel installation
- Mechanical system support
- Navigation infrastructure repairs
- Marine access and barge-based work
- Work in active river environments
Construction, Repair, and Rehabilitation for Hydroelectric Facilities Hydroelectric Dams
Hydroelectric dams require specialized support above and below the waterline. Brennan provides construction, rehabilitation, inspection, and repair services for hydroelectric facilities and related infrastructure, helping owners protect performance, extend asset life, and support reliable power generation.
Our experienced welders, ADCI-certified commercial divers, marine construction crews, and specialty equipment allow us to safely complete work on critical dam components in challenging operating environments.
Key Capabilities
- Hydroelectric dam rehabilitation
- Intakes and headworks
- Penstocks
- Powerhouse structures
- Spillways
- Tailraces
- Gates and actuators
- Trash racks
- Fish passage and protection
- Cofferdams and dewatering
- Underwater inspection and repair
- Golden mussel inspection, response, and eradication
- Structural and mechanical improvements
Fish Passage Solutions That Support Infrastructure and Ecosystems Fish Passage & Protection
Fish passage and protection work requires a careful balance between structural performance, ecological goals, regulatory requirements, and site-specific hydraulic conditions. Brennan helps dam owners, utilities, engineers, and public agencies support fish migration, reduce aquatic impacts, and improve environmental performance around dams and water-control structures.
We bring marine construction, dam rehabilitation, commercial diving, concrete, steel, and access expertise to projects involving fishways, bypass systems, barriers, screens, and habitat-related improvements. We understand how to work in sensitive aquatic environments while maintaining safety, quality, and schedule control.
Key Capabilities
- Fish passage construction
- Fish protection systems
- Fishways and bypass structures
- Fish deterrants, screens, and guidance systems
- Intake protection improvements
- Concrete and steel installation
- Underwater inspection and support
- Marine access and cofferdams
- Habitat-focused infrastructure improvements
- Coordination with engineers, agencies, and stakeholders
Temporary Water Control for Safe, Efficient Dam Work Cofferdams
Cofferdams are essential for creating controlled work areas in and around dam structures. Brennan designs and installs cofferdam systems that help isolate work zones, manage water intrusion, improve access, and create safer conditions for construction, inspection, repair, and rehabilitation.
With deep experience in marine construction, river work, dam rehabilitation, and underwater conditions, Brennan understands how to plan and execute cofferdam work in complex environments where water levels, flows, access, and structural conditions must be carefully managed.
Key Capabilities
- Cofferdam installation and removal
- Temporary water control
- Isolation areas
- Sheet pile cofferdams
- Cellular cofferdams
- Dewatering support
- Marine access and staging
- Work zone protection
- Underwater inspection and preparation
- Support for concrete, mechanical, and structural repairs
Mechanical & Structural Support for Critical Dam Components Gate & Actuator Replacement
Gates, actuators, and related mechanical systems are essential to dam performance, water control, and long-term reliability. Brennan provides replacement, repair, and installation support for gate and actuator systems in complex dam environments.
We support mechanical work with marine access, commercial diving, structural steel, concrete repair, lifting, rigging, and construction capabilities, giving owners a single partner for work that often requires multiple specialties.
Key Capabilities
- Tainter gate, gate replacement
- Actuator replacement
- Mechanical system installation
- Structural steel support
- Embedded component repairs
- Lifting and rigging
- Concrete modifications and repairs
- Underwater inspection and support
- Stoplog and bulkhead support
- Coordination with engineers and equipment suppliers
Concrete Construction & Repair for Dam Structures Concrete Placement & Repairs
Dam concrete must perform in demanding conditions, including constant water exposure, freeze-thaw cycles, hydraulic forces, aging infrastructure, and difficult access areas. Brennan provides concrete placement and repair services for dam structures above, below, and adjacent to the waterline.
We support new concrete construction, rehabilitation, formwork, underwater preparation, surface repairs, and structural improvements with the planning and quality control needed for critical infrastructure.
Key Capabilities
- Lock chamber repairs
- Concrete placement
- Concrete repairs
- Structural concrete rehabilitation
- Spillway repairs
- Intake and headworks repairs
- Formwork and reinforcing steel
- Precast concrete installation
- Underwater concrete support
- Surface preparation
- Quality-focused concrete execution
Specialty Grouting for Dam Rehabilitation & Water Control Erosion Support & Grouting
Grouting plays an important role in dam rehabilitation, seepage control, structural stabilization, and foundation improvement. Brennan provides specialty grouting support for dam and water-control projects that require careful planning, controlled placement, and experienced field execution.
Our crews work in challenging dam environments where access, water, pressure, and subsurface conditions can complicate even routine repairs. Brennan helps owners and engineers implement practical grouting solutions that support long-term performance.
Key Applications
- Dam grouting
- Erosion Repairs
- Breakwaters
- Riprap & armoring
- Foundation grouting
- Structural stabilization
- Crack injection
- Contact grouting
- Underwater and difficult-access support
- Monitoring and verification support
- Integration with broader dam rehabilitation work
One Partner for Complex Dam Infrastructure Why Brennan for Dam Construction?
Dam projects often involve structural, mechanical, underwater, environmental, and marine construction challenges at the same time. Brennan brings those capabilities together under one experienced team.
Our marine construction crews, commercial divers, welders, operators, concrete specialists, and project managers understand how to work safely and efficiently in active water-control environments. That integrated approach helps clients reduce coordination challenges, manage risk, and keep critical infrastructure projects moving.
What Sets Brennan Apart
- More than 100 years of experience working in and around the water
- Award-winning safety performance in safety-critical environments
- Collaborative, honest delivery with owners, engineers, suppliers, contractors, regulators, and stakeholders
- Experience supporting locks, dams, hydroelectric facilities, and water-control structures
- Marine construction and commercial diving capabilities under one team
- Skilled crews for concrete, steel, cofferdams, grouting, and mechanical support
- Equipment and access methods built for challenging dam environments
Total Quality Management Across the Organization
- ISO 9001 (Quality Management Systems)
- ISO 14001 (Environmental Management)
- ISO 45001 (Occupational Health and Safety Management)
- ASME NQA-1 (2022), 10 CFR 50 Appendix B, and 10 CFR Part 21
Whether you need support with a lock and dam, hydroelectric facility, fish passage project, cofferdam, gate replacement, concrete repair, or specialty grouting, Brennan has the people, equipment, and experience to help you complete the work safely and effectively.
What Our Customers Are Saying Client Testimonials
Serving Coastal & Inland Waterways Office Locations
Bring Brennan Into Your Complex Dam Infrastructure Project
Whether you need support with a lock and dam, hydroelectric facility, fish passage project, cofferdam, gate replacement, concrete repair, or specialty grouting, Brennan has the people, equipment, and experience to help you complete the work safely and effectively.
Stay Connected With Brennan
Sign up for Brennan’s e-newsletter to receive company news, project updates, announcements, insights, and other information from across our work.