en.Wedoany.com Reported - Kiewit has completed all roller-compacted concrete (RCC) placement at the Gross Reservoir Expansion Project in Colorado, marking a key construction milestone for the dam heightening project.

According to the contractor, the project has raised the crest height of Gross Dam by 130 feet (40 meters) to 470 feet (143 meters), making it the tallest dam in Colorado. Only one vertical foot of structural concrete slab remains to be placed, and the dam is nearing its final design height.

As of June 2026, the project has placed over 744,000 cubic yards (569,000 cubic meters) of roller-compacted concrete and 59,000 cubic yards (45,000 cubic meters) of conventional concrete facing.

The goal of the Gross Reservoir Expansion Project is to increase water storage capacity for the Denver metropolitan area. This dam heightening project is one of the largest roller-compacted concrete dam construction projects currently underway in the United States.

Following the completion of RCC placement, subsequent construction will focus on remaining structural concrete work for the dam crest, spillway, and stilling basin, as well as installation of mechanical, electrical, instrumentation, and safety systems.

Kiewit stated that the entire project is expected to be completed by October 2027.

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