goes all the way to top.

You can't climb to observation deck, you have to ride up make a reservation in advance.

There is parking (free) on the river below the arch. You just walk up the steps and you are there

They only steps you walk up is from the parking on the river.

If you want to see the museum before hand, arrive an hour or two before

I would get there 30 minutes early because you do have to go through security. I also highly recommend using the link in your ticket confirmation email to pre-pay parking. And hour and a half should be long enough u less you want to read each and every sign in the museum area.

Yes. There are metered spaces along the street and several parking decks. We parked in the deck at 4th and Olive, it is $2 per hour and only 2 blocks from the Arch entrance.

Yes. Just call them, there's a possibility of getting tickets. Don't just show up hoping to get them tho- unless you're there right when they open. They usually sell out fast.

Only on Sundays is street parking free and you don't have to feed the meter. On other days, you need to park in a garage or load an app and pay for parking on the street.

We were not required to provide proof of vaccination when we went in October.