A few years back I caught a hatchery steelhead on the lower Kalama that had a tag on a fin, a biologists checked the fish later in the day and told me that as far as he knew the tag wasn't from the Kalama hatchery, he said its possible for a fish headed up river to mill around in other tribs posibbly looking for cooler water then the main Columbia flows, if this is true, its possible those unclipped fish are headed elsewhere,just milling around till the urge hits them to move on. Just a thought.