text:  The Amtrak service through Alabama, Mississippi, and Louisiana has been suspended since Hurricane Katrina in 2005. Jim Crisula, CBS News. Lake Louise in Florida is the cleanest lake in the U.S., according to the vacation rental platform Lake.com, which analyzed chemical data from the National Water Quality Monitoring Council for lakes sampled since last January. The analysis included levels of dissolved oxygen, ammonia, lead, and other characteristics. Wendy Gillette, CBS News.