The rangers have all the information and will tell you if you ask. In our case, we were going on the route description in Gator's book which was dated. It did make it clear that rappels would be necessary. With our party of four, we could have gone on one rope, but we took two at my insistence and were glad.
I felt bad about Rob. He rushed up and down the route hoping to catch us in time to use our ropes, but those crazy Czechs were going so fast. He missed us by about 20 minutes.