Every one of Utah's three charter waters crosses a state line. Lake Powell runs into Arizona, Flaming Gorge into Wyoming, Bear Lake into Idaho — and Powell and Flaming Gorge are Green and Colorado impoundments, so nothing here is in the Mississippi system and 33 CFR 83.03(n) Western Rivers reaches none of it. No Part 80 line is drawn in Utah, which leaves plain Inland Rules under 83.03(q). The interesting consequence is that the border is invisible to the credential and very visible to everything else: the same houseboat trip up Powell can begin in Utah and end in Arizona under one federal endorsement, while the guide licence, the sales tax and the launch permit change at a line the Rules of the Road do not recognise. Keep the sea-service record on the federal side of that distinction — water, vessel, tonnage, dates — and REC Long Beach can read it without the state detail at all.
33 CFR Part 80 draws no demarcation line in Utah. Its 106 sections cover the Atlantic, Gulf and Pacific coasts, Puerto Rico and the Virgin Islands, the Pacific islands and Alaska; a state with no coast has no section, which is itself the answer.
This decides which rulebook you steer by, not where your credential may operate: the route limit is the 46 CFR Part 7 Boundary Line, and the two lines are not drawn in the same place. How the two lines differ · International Rules · Inland Rules
33 CFR Part 80 and the Part 83 definitions above read from eCFR on 12 Aug 2026. Any specific water is a determination for the cognizant Coast Guard Officer in Charge, Marine Inspection.