Name of the Project
Gross reservoir expansion project.

Location
Denver, Colorado, in the US.

Client
Denver Water.

Project Description
The expansion will more than double current reservoir capacity and improve water supply dependability for the 1.4-million people Denver Water serves in the metro area.

The project will raise the height of the existing 104 m dam by about 40 m, increasing reservoir capacity from 1.58-million cubic metres of water to 14.68-million cubic metres of water.

The project will also increase the total output of the Gross dam’s hydroelectric power plant from 7.6 MW to 8.1 MW. The expansion will make the Gross dam the highest dam in Colorado and will increase the dam size to 1.145-million cubic metres of concrete, about half the volume of Hoover dam.

Jobs to Be Created
Not stated.

Value
Not stated.

Duration
The first filling of the reservoir is expected in April 2026.

Latest Developments
Black & Veatch has been selected to provide management services for Denver Water on the Gross reservoir expansion project. It will assist Denver Water with project controls – including schedule, cost and document control, and eventually construction management – which started in May and will continue to the first filling of the reservoir, expected in April 2026. Once permits have been secured, dam construction is expected to be implemented in three phases over a total of four to five years.

Key Contracts and Suppliers
Black & Veatch (provide management services).

On Budget and on Time?
Too early to state.

Contact Details for Project Information
Denver Water, tel +1 303 628 6348 or email grossreservoir@denverwater.org.