How much is the permit to fish there. I know you have to get it from Browders.
Last time I was there it was $8 to get in and launch...more for each extra person in the vehicle.
12 gates open you want to be careful out there. It is a very unforgiving environment. When the flow gets this high often there will be a standing wave that can be pretty uncomfortable.
IMO its better to wait until the flows get down to 10,000 and below.