Looking for a casual family float trip? Ruby / Horsethief provides a very mellow 25-mile float with one rapid, generally considered class II. This is a good trip for beginners or families. Aside from the one rapid, and short section of turbulent water, the other 24 miles is very easy and relaxing. The scenery is second to none, with ample opportunity for side hikes.
The flow should be BELOW 30,000 CFS for rafts. For those in a canoe, less than 20,000 CFS if experienced, less than 10,000 CFS if inexperienced. For family trips, lower is better. Note that afternoon winds can slow down the trip greatly.