7. Lake Pleasant, Arizona
Manmade Lake Pleasant is the centerpiece of a popular boating and fishing destination near Phoenix. Its primary danger is in boating accidents, where it made the top 15 most dangerous bodies of water in the nation according to the U.S. Coast Guard. Local officials regularly caution boaters not to drink and drive and to be sure they have enough life jackets. And carbon monoxide is a risk anytime many boats gather in one place with their engines running.
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