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Document library Videos
Testing roller compacted concrete at Gross Reservoir

Denver Water is testing the roller compacted concrete process in preparation of raising the height of Gross Dam for the Gross Reservoir Expansion Project.

Concrete placement at Gross Reservoir summer 2023

This video takes a look at how construction workers place concrete as part of Denver Water's Gross Reservoir Expansion project in Boulder County, Colorado.

Gross Reservoir Expansion June 2023 update

Substantial progress made on Gross Reservoir Expansion Project to ease Denver’s storage imbalance.

Gross Reservoir Expansion Project spillway work

Why one part of the dam must come down before it goes up.

Concrete placement at Gross Dam for Denver Water

A look at some of the prep work needed before raising Gross Dam can begin.

CU engineering students visit Gross Reservoir with Denver Water

Denver Water is partnering with CU Boulder to give civil engineering students a look at the Gross Reservoir Expansion Project.

Hydrodemolition at Gross Dam

Denver Water is using a process called hydrodemolition to roughen the surface of Gross Dam in Boulder County, Colorado, to prepare the dam for additional concrete to raise the height of the dam.

Gross Reservoir boating and fishing update

Gross Reservoir is a popular place for kayaking and paddleboarding in Boulder County. The reservoir is operated by Denver Water for Front Range water storage.

Jeff Martin and the Gross Reservoir Expansion Project

Learn about Denver Water's Gross Reservoir Expansion Project with Jeff Martin, Denver Water's program manager.

Gross Reservoir Expansion Project update 2

This is a construction update on the Gross Reservoir Expansion Project on April 20, 2022.

Gross Reservoir Expansion Project update 1

Denver Water began construction on the Gross Reservoir Expansion Project in April 2022. This is an update on the work.

Where does Denver Water get its water from?

Denver Water serves water to over 1.5 million people in metro Denver. Learn where Denver Water collects its water from in this video.

Gross Reservoir final federal approval

A plan to expand Gross Reservoir in Boulder County cleared its final federal hurdle on July 16, 2020, when the Federal Energy Regulatory Commission gave its approval for the project and ordered Denver Water to proceed with design and construction.

The $464 million (in 2025 dollars) expansion involves raising Gross Dam by 131 feet to nearly triple the size of the reservoir behind it.

Reducing the impacts of a big expansion

Construction projects come with impacts, that’s a fact. But there’s plenty that can be done to minimize those impacts, and there’s plenty Denver Water is planning to do — and has already done — to address concerns raised by neighbors who live near the Gross Reservoir Expansion Project.

Testing Gross Dam's new spillway at CSU

Denver Water teamed up with the researchers at Colorado State University's Hydraulics Laboratory to test the new design for the spillway that is part of the Gross Reservoir Expansion Project.

Denver Water presentation to Boulder County commissioners on Gross Reservoir Expansion Project

March 14, 2019, Denver Water staff, Mike King, Jessica Brody and Jeff Martin, presented to the Boulder County commissioners on the Gross Reservoir Expansion Project and listened to public comment presented during the four and a half-hour meeting.

Benefits of Gross Reservoir expansion gain statewide support

State of Colorado certification moves Gross Reservoir Expansion Project closer to reality, and cooperation is the key.

Denver Water Gross Reservoir Public Information Yurt

The yurt is located just up the hill from Denver Water’s Gross Reservoir caretakers’ offices at 3656 Gross Dam Road and is slated to be open at least four days every week between Memorial Day and Labor Day.

Fishing Fraser Flats in Grand County

A section of the Fraser River in the Fraser Flats is now open for public fishing in Grand County, Colorado. Learn how river restoration has helped the trout population.

Fraser Flats River Restoration

The Fraser Flats section of the Fraser River is showing signs of improvement after a river restoration project in 2017. The work was part of the Learning By Doing partnership between Grand County, Trout Unlimited, Denver Water and others.

Denver Water Gross Reservoir Expansion permit granted

Following nearly 14 years of careful study, including six years Denver Water spent negotiating the landmark Colorado River Cooperative Agreement, the Army Corps of Engineers has approved Denver Water's request to raise Gross Dam in Boulder County.

Fraser Flats Restoration Project May 2017

Volunteers from across Colorado helped plant willows and cottonwoods on a stretch of the Fraser River known as the Fraser Flats in May 2017. Learn how the project will improve the habitat for the trout fishery.

Fraser River sediment pond

Denver Water partnered with CDOT and Grand County to remove traction sand from the Fraser River. CDOT has removed nearly 2,000 tons of sediment since 2012.

Learning By Doing: Fraser Flats

Learning By Doing, a partnership between East and West Slope water interests in Colorado including Denver Water, is planning a project to enhance a stretch of the Fraser River in Grand County, Colorado. The Fraser Flats River Restoration Project is scheduled to begin construction Fall 2017.