Can you pay for parking upon arrival to the Gorge or do you need to purchase a parking pass in advance?

general parking is free

That would be nice. I don't know.

I have never had to pay for parking. Isn't general parking free?

I depends on th3 show you're attending, but it's best to buy ahead of time. They do sell out.

It's best to buy ahead of time. Usually they have a place to buy upon arrival... It may be a bit of a wait though.