Interior Department ordered to study depth-control system at Glen Canyon Dam

What does this do?

HR 8113 directs the U.S. Department of the Interior to study whether a selective water withdrawal system can be added to Glen Canyon Dam in Arizona. Such a system would let operators draw water from different depths of Lake Powell, giving them control over the temperature and quality of water released downstream. The study has two focus areas: whether the system could improve electricity generation and whether it could help stop invasive species like quagga mussels from spreading.

Who does it affect?

The bill most directly affects water users, electric utility customers, and fishing and recreation industries across seven Western states: Arizona, California, Colorado, Nevada, New Mexico, Utah, and Wyoming. Tribal nations and environmental groups with interests in the Colorado River are also affected.

Why does it matter?

The current fixed-depth release system means operators cannot control the temperature or quality of water sent downstream, limiting options for managing the river. If the study concludes the system is worth building and power companies that use the dam agree, construction could proceed.

What does it cost, and who pays?

• Paid by federal taxpayers
• Study costs are nonreimbursable