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Dam Maintenance Contractor

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Willow Creek Dam

Design-Build Solutions for Dam Stability and Longevity

GeoStabilization International is the dam maintenance contractor trusted by dam owners, utilities, and agencies to restore performance, control seepage, and improve safety across North America.

Our design-build teams combine geotechnical investigation, modeling, instrumentation, and construction to address seepage, erosion, slope instability, and concrete deterioration, delivering safe, constructible solutions with minimal downtime and environmental impact.

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Seminoe Dam

Why Choose GSI for Dam Rehabilitation

  • Comprehensive Program: Condition assessments, geotechnical investigations, hydrologic and hydraulic modeling, seepage analysis, and safety inspections integrated with construction under one accountable partner.
  • Seepage Control and Foundation Improvement: Targeted permeation, curtain, and consolidation grouting programs to seal leaks, fill voids, and strengthen foundations.
  • Embankment and Abutment Stabilization: Soil nails, anchors, geosynthetics, and horizontal drains to lower pore pressures and increase slope stability.
  • Concrete Repair: Crack injection, patching, and rehabilitation of spillways, stilling basins, chutes, and outlet works.
  • Access-Limited Expertise: Purpose-built steep-slope drills, rope access, and compact equipment reduce disturbance and eliminate the need for haul roads.
  • Emergency Response: Rapid mobilization for post-storm, post-fire, or seismic events affecting channels, outlets, or downstream crossings.

Our Dam Maintenance Capabilities

Permeation and cementitious grouting for seepage reduction, void filling, and foundation improvement, complete with quality assurance and testing protocols.

Soil nailing, anchoring, geosynthetic reinforcement, drainage, vegetation management, and launched or drilled drains to reduce pore pressures.

Structural and surface repairs for spillways, chutes, and appurtenances, including crack injection and corrosion protection.

Armoring and scour control at outlet works, energy-dissipation zones, and downstream crossings.

Limited-access deep foundations for towers, gates, and retrofits where vibration control and stability are critical.

Sensors, data collection systems, and remote monitoring to track dam performance and trigger proactive maintenance.

GSI has supported dam restoration projects nationwide, including rehabilitation of the Willow Creek Reservoir in Nevada.

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View of Willow Creek Reservoir in March 2018 as work began to restore the dam

How GSI Delivers Dam Rehabilitation

  • Assessment and Modeling: Site reconnaissance, geotechnical investigations, and hydrologic/hydraulic modeling to define risks and prioritize interventions.
  • Design-Build Planning: Integration of seepage control, stabilization, and repair details with constructability, access, and phasing considerations.
  • Access and Construction: Specialized rigs, rope or line access, and staged construction to maintain operations while minimizing footprint.
  • Commissioning and Monitoring: As-builts, operations and maintenance documentation, and long-term instrumentation or remote monitoring programs.

The GSI Advantage

 

One Team, Fewer Interfaces

Investigation, design, and construction under one roof for streamlined delivery and faster schedules.

Built for Difficult Terrain

Limited-access methods minimize excavation, haul-road construction, and environmental disturbance.

Proven Mitigation Toolkit

Grouting, drains, nails, anchors, micropiles, shotcrete, and scour protection tailored to site geology and hydraulic conditions.

Nationwide Coverage

Local responsiveness backed by deep expertise in dam safety and rehabilitation.

Client Reviews

Reliable Project Support in South Dakota

Cameron, I’m glad you followed up because I don’t do a good job of telling people they did a good job sometimes and I know you’re like me if you hear nothing bad then it must have been OK. From my standpoint, you guys really helped us out by being able to get a crew here quickly which is just what we needed. As for the crew they were fantastic, pretty hands off on my end, didn’t require much of my time and did everything they said they were going to do when they said they were going to do it. Which believe me is very refreshing. So, thank you guys for all your help and I do look forward to an opportunity to work with you again.

Skilled and Professional Crew Support in New Mexico

I want to thank you and your crew for the exceptional job we just completed. It was a pleasure working alongside Brice and his crew. All of them are very stand-up men and have amazing respect, are knowledgeable with the process and technique, and all deserve an “Atta-Boy”. (Ha-ha). If you could pass this along to your superiors I would appreciate it. Once again, it was a pleasure working with GSI and this crew.

Organized and Dependable Crew Support in Vermont

You and Chris are awesome to work with! … Your crews that have been here are all very well organized, dependable and get their work done! GSI should be very proud of the crews they have working for them. Thanks again Perry for all your help and assistance!

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Need a dam maintenance contractor for seepage control, stability, or concrete repair? GSI’s design-build approach delivers rapid, reliable rehabilitation for dams, embankments, and abutments—keeping infrastructure safe and service-ready.

Request a site assessment or proposal today.

855.579.0536

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    Our Awards, Certifications, & Memberships

    ENR Regional Best Project 2023
    ADSC Safety Award
    GeoHazard Professionals Safety Recognition
    Gold Shovel Standard Certified
    GSI is a Directing Member of the Association of Geohazard Professionals
    GSI is a TOP 10 Military Friendly Employer