Lee, here's a map snipit showing Road Prong. It joins Walker Camp Prong which flows in from the right. Orange is brook trout water, red is brook/rainbow mix per NPS Fisheries Management data.
This is part of the printed Upper West Prong of LPR map that will be available in about a week.
I can't think of a better gift for your brother. Hope you guys have good luck. Have fun regardless.