Below Scofield the creek drops into a canyon you reach on foot, and the regulation matches: from the railroad bridge roughly a mile below the dam downstream to the White River confluence, it is artificial flies and lures only. The combination of that rule and the walk keeps the pressure down. There is no closed season, so the water fishes in February as well as July, though getting to it in February is another matter.
Because it fishes all twelve months while most of central Utah is locked up, and the fish are wild browns rather than stockers. It is bait free water, artificial flies and lures only, and you have to walk in to reach it. Scofield State Park sits minutes away if you want a base.