Bill orders study on curbing invasive fish below Glen Canyon Dam

What does this do?

This bill directs the Secretary of the Interior to study ways to control invasive fish downstream of Glen Canyon Dam, including possible engineering fixes like a thermal curtain or selective water withdrawal system. The study, due within 18 months, must be followed by a report to Congress on costs, construction options, and hydropower effects. If feasible, the Secretary could then pursue design and construction, though the authority expires five years after enactment.

Who does it affect?

The bill affects Southwest residents and businesses relying on Glen Canyon Dam hydropower, water managers in the seven Colorado River Basin states, environmental groups, and Native American tribes and recreational users tied to the Grand Canyon ecosystem. It also involves the Department of Energy, Fish and Wildlife Service, Geological Survey, and power companies.

Why does it matter?

Cold water releases from the dam affect both protected native fish and invasive species downstream, and any change to release temperatures could also affect hydropower efficiency and rates. The study does not immediately change dam operations or reservoir management rules for Lake Powell and Lake Mead.

What does it cost, and who pays?

• Study funded with federal dollars
• No repayment required
• No cost figures specified