Yahh... a 12 foot raft shouldn't be a problem at 600 cfs, the river is basically still wide but it's a lot less pushy than normal levels. If I remember correctly there are two tight spots on the river; Snake Pit is pretty bony but not too consequential and there's a river wide ledge that turns into a hole at higher water. You should be able to run Snake Pit but I'm not sure if the ledge is runnable in a raft because only the left side has water flowing through it (there's not enough room for a raft). You'll recognize what I'm talking about when you see a horizon line after all of the major rapids. Have fun.. I wish I could go paddling.