I fished Flat Creek for a few hours with my neighbor a few years ago. I didn’t get anything; my highlight was a half-hearted refusal, after trying 4 different emerger patterns, from a cutt that might have gone 10”. My neighbor got 2 over 20” by jigging a saltwater Clouser along undercut banks; he’s an excellent caster and fisherman but he also has a predator’s instinct.