FLORENCE, Ore. -- A Hillsboro woman playing a slot machine at a casino in Florence won $5 million Friday night.

The woman, who chose to remain anonymous, had been playing the Penny Wheel of Fortune machine at Three Rivers Casino and Hotel.

According to the casino, the woman initially thought she won $60 or possibly $600 when three Wheel of Fortune symbols lined up. The machine indicated she should call an attendant.

A casino spokesman said the woman had been in the casino for less than an hour and won the $5 million using a $4 bet.

The progressive slot machine is part of a network of machines linked throughout the West Coast and accumulates a percentage of the play on all machines, allowing for large payoffs.

The spokesman said the previous high slot machine payoffs at the casino have been $1.3 million in 2005 and $855,769 in 2008. The $5,284,316 win is a record for the casino.