Officials said they expect more than 5,000 people to show up for the Rafting Gone Wild event on the American River.

For the first time, alcohol has been banned, and a huge police presence is expected to crack down on partygoers.

The non-licensed event begins at 11 a.m.

The alcohol ban was implemented to avoid fights and problems among rafters.
Officials said anyone who brings beer or other liquor will get a citation, be removed from the event and not allowed on the river or the shoreline.

Fire Department Capt. Bryan Thomson said dozens of drunken people need to be rescued from the water every year.