Colstrip plants 3 and 4 got a provisional green light and Missoula City Council voted to remove the Milltown Dam.

America is celebrating its 250th anniversary, and the nation's capital is undergoing significant changes under President ...

Arizona's congressional delegation has selected one of the state's most enduring symbols — copper — to represent Arizona in a time capsule that will remain sealed until the ...

The federal government is considering a framework to cut Colorado River water use in Arizona, California and Nevada by as ...