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Gross Reservoir Expansion (Gross Dam Raise)

We worked with Denver Water to expand the reservoir at Gross Dam by raising the existing 340-foot-high concrete structure

  • £10M

    Design Value

  • £371M

    Construction Value

  • 340

    Foot High Dam - Raised 131 Feet with RCC

  • Boulder, Colorado

    Boulder, Colorado

The tallest dam—using roller-compacted concrete—in the world

We think that strong relationships are key to success on any project—that’s why Denver Water has known they can trust us to provide engineering support for their dam projects for over 40 years, including the Gross Reservoir Expansion Project.

Our international team’s work on the Gross Dam has included a broadband of dam safety services, including safety inspections, site-specific Probable Maximum Precipitation (PMP), Seismic Hazard Assessments (SHA) and planning studies for additions to the dam itself. We’ve even prepared an innovative, cost-effective final design for raising Gross Dam that modifies the concrete gravity dam into an arch dam to create a structure that will last two thousand years with the proper care and maintenance. This project is the largest raise of a concrete dam using roller-compacted concrete (RCC) in the world.

Over the years, we’ve combined innovative design with proven technologies to develop solutions that minimise risk to Denver Water and their surrounding communities. We worked to minimise impacts to the communities, and ensured our plans and specifications were clear for the contractors to make sure changes to scope and cost during construction were minimal.

At a Glance

  • Denver Water

Raising dams to provide water security

Stantec designed what will be the largest raise of a concrete dam using roller-compacted concrete (RCC) in the world. The best part? It will improve water reliability for more than 1.5 million people throughout Colorado’s front range.

Expert Spotlight

Rhiannon Meredith, Senior Dams Engineer

Every day my job is challenging and varied—and has allowed me to travel and see places that people don’t normally get to see.

Rhiannon Meredith

Senior Dams Engineer

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