Best guide on the Yellowstone is Matthew Long, Long Outfitting in Livingston. He knows the river, knows the fish and treats his clients to an incredible best shore lunch, not just soggy sandwiches and pop. I've floated with Matthew numerous times and they were all memorable, catching many, many fish. He is a real gentleman and treats his clients with great respect. I met many anglers that floated with other guides though the years and they did not have similar experiences. He also knows the spring creeks like the back of his hand.