It depends on the creek if it's safe to have your chickens near it. Mine free range and go to the creek I have all the time for a drink of water, but it's got a very gradual shallow bank and the water is not moving fast. If your creek is strong or has a sharp bank I would not let them have access to it. Chickens don't swim.
For the feathers you either have a lice problem or feather picking going on, or as stated they are the cornish cross chicks that just grow so fast in body they don't get the feather cover fast enough that they don't look bald.
For the feathers you either have a lice problem or feather picking going on, or as stated they are the cornish cross chicks that just grow so fast in body they don't get the feather cover fast enough that they don't look bald.