A lack of rain in the central part of the United States has created a crisis on the Mississippi River. The most important inland U.S. waterway is reaching historic low levels, which could significantly disrupt shipping. As VOA’s Kane Farabaugh reports, the U.S. Coast Guard, which plays a key role in determining whether the river stays open to traffic, is keeping one eye on the receding river, and another on the skies - hoping for rain.