American Falls Reservoir

This Is the Cleanest Lake in the U.S.—and It Has Crystal-clear Waters and Zero Pollution

"I observed that the American Falls Reservoir in Idaho appeared clear to the human eye, but chemical tests detected the presence of ammonia, which the study noted should not be present at all." - Katie Nadworny Katie Nadworny Katie Nadworny is an Istanbul-based writer who specializes in stories at the intersection of culture and politics in Turkey, Eastern Europe, and the Middle East. She has lived in Turkey for nearly a decade and has traveled extensively around the region. Travel + Leisure Editorial Guidelines