Fastest Mississippi River Transit?

[triprice]

Does anyone know where I can find information regarding the fastest transit of the Mississippi River from it's mouth to it's headwaters in Minnesota? I looked for sereral days on the web with no luck. I did find a reference to an amazing 12 hour run from New Orleans to St Louis, but nothing for a transit of the whole river. I also tried the Guiness World Record site with no luck as well.

Any help out there?