Helvetia tavern is okay, but not as special as Portlanders make it out to be. The burgers are plain as plain can be, the restuarant is small, and service is so so.
I know its a pub and not a 5 star place, but seriously, a little goes a long way people.
It's too far of a drive for a so-so burger. Stay closer to town unless you are looking to ride your bike on some nice country roads.