Now remembering the first time I camped next to the upper SF Payette. As I settled into my bag waiting to drift off to sleep, I thought I heard some large hooved creature walking on the rocks. As I listened intently, I imagined there was a moose ambling along the river bank. The cadence of the sound was too slow and too random though. It took me way longer than it should have to realize that what I was hearing, combined with the sound of rushing water, was melon sized rocks that were making their slow migration downstream - one muffled clack at a time.