The "wild and scenic" designation affords protection to parts of the river and its immediate environment. Idaho Sen. Larry Craig says the bill raises concern that the flow of the river would be affected once it gets to his state.

Committee members defeated two Craig amendments intended to ensure that Idaho water rights are protected after the designation. The Idaho Republican says the river, quote, "starts in Wyoming, but its water belongs to Idaho and is Idaho's most significant water source."

Wyoming Republican Sen. John Barrasso says the legislation would not affect water rights at any part of the river. He says the rivers generate millions of dollars annually for the state of Wyoming and contribute to local economies. The bill is now pending consideration by the full Senate.