I dunno, the choices are so muddled --

Stay put, make shelter, start fire - be semi dry and warm and wait for the water to recede. Boredom may set in, but what the hey, I carry an MP3 with radio most of the time. Time to study for "Don't forget the Lyrics".

or

Make a raft of some type, using the guts of the paracord, then use the outside of the paracord to pendulum across (I'm thinking this was the answer the OP was looking for) and if everything works out and I don't die of hypothermia or drowning I get home in time for whatever was so freaking important I couldn't miss it. Except I can't think of anything that important that I would risk my life in what is an obviously a suicide attempt to cross cold rushing water in the winter.