Skip to main content
Start of main content

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

  • $13M

    Design Value

  • $464M

    Construction Value

  • 340

    Foot high dam - raised 131 ft 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 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 minimize risk to Denver Water and their surrounding communities. We worked to minimize 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

Offices
Client
  • Denver Water
Partners
  • AECOM
Meet Our Team

Mike Rogers, Vice President, Global Dams Practice Leader, WaterPower & Dams

The projects we build last generations. Our designs must be sustainable and long lasting for the communities they serve.
Mike Rogers Vice President, Global Dams Practice Leader, WaterPower & Dams Read More

Aled Hughes, Principal, Civil Engineer, WaterPower & Dams

I am passionate about dam safety and its influence in the strategic planning of hydropower site development.
Aled Hughes Principal, Civil Engineer, WaterPower & Dams Read More

Glenn S. Tarbox, Senior Vice President, Waterpower & Dams

I always enjoy my work, but I truly love the everyday relationships I’ve been fortunate enough to create over the years—it drives me every day.
Glenn S. Tarbox Senior Vice President, Waterpower & Dams Read More

Christine Weber, US South Central Regional Sector Lead, WaterPower & Dams

I’m immensely pleased when our hard-earned knowledge and experience lead to elegant solutions for complex dam designs and dam safety issues.
Christine Weber US South Central Regional Sector Lead, WaterPower & Dams Read More
  • Mike Rogers

    Vice President, Global Dams Practice Leader, WaterPower & Dams

  • Aled Hughes

    Principal, Civil Engineer, WaterPower & Dams

  • Glenn S. Tarbox

    Senior Vice President, Waterpower & Dams

  • Christine Weber

    US South Central Regional Sector Lead, WaterPower & Dams

We're better together

  • Become a client

    Partner with us today to change how tomorrow looks. You’re exactly what’s needed to help us make it happen in your community.

    Contact Us
  • Design your career

    Work with passionate people who are experts in their field. Our teams love what they do and are driven by how their work makes an impact on the communities they serve.

    Join the Team
End of main content To top