Isaac may be gone in Tangipahoa Parish but tens of thousands of people are under an evacuation order.
This includes everyone within a half mile east or west of the Tangipahoa river.
There's concern the Percy Quin Dam could breach.
Right now the state of Mississippi is conducting a controlled breach of the dam.
The breach is an attempt to lower the water level.
Governor Bobby Jindal says, as of now there's pressure on two areas of the dam.
Because of this Bobby Jindal wants people to get out.
Between 40 and 60 thousand people are in the evacuation zone.