What happens to the raft at the end of chapter 16?

While drifting downstream, they encounter an oncoming steamboat. Instead of getting out of their way as the steamboats usually do, the boat ploughs directly over the raft. Both Huck and Jim are forced to dive overboard. Huck emerges and grabs a piece of wood with which he paddles to the shore. Jim is nowhere to be seen. Huck is soon surrounded by dogs and stands dripping wet and immobilized.