Much of the water from the past week's record rains in Colorado have funneled into the South Platte River, which flows eastwards in Nebraska. A 10 - 11' high flood crest is headed downriver, and is setting all-time flood height records as it heads east. By Wednesday night, the crest will reach western Nebraska at Roscoe, where the flood waters may cover Interstate 80, unless sandbagging efforts to protect the highway are done. Interstate 80 is one of the two most heavily traveled transcontinental highways in the United States.

http://www.wunderground.com/blog/JeffMasters/comment.html?entrynum=2525