Pennsylvania's two navigable regimes are 300 miles apart and use different definitions. Presque Isle Bay and the Lake Erie shore at Erie are Great Lakes water under 33 CFR 83.03(q) — inland by definition, no Part 80 line — with the 83.23(e) lights option available. The Ohio, Allegheny and Monongahela at Pittsburgh are Western Rivers under 83.03(n), where the downbound-with-current provisions at 83.09(a)(ii) and 83.14(d), the crossing reversal at 83.15(b) and the towing exception at 83.24(j) apply. Pymatuning Reservoir is an ordinary inland lake. Because 46 CFR 11.467(b) excludes the Great Lakes from a plain inland OUPV, the steelhead and walleye fleet out of Erie needs the Great Lakes and inland endorsement — and Pennsylvania candidates test at REC Toledo or REC New York depending on which end of the state they work.
33 CFR Part 80 draws no demarcation line in Pennsylvania. 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.
Great Lakes water (Lake Erie) needs no Part 80 line: 33 CFR 83.03(q) defines inland waters to include the waters of the Great Lakes on the United States side of the International Boundary. Under 46 CFR 11.467(b) a plain inland OUPV endorsement covers all inland waters except the Great Lakes.
Western Rivers (the Ohio, Allegheny and Monongahela Rivers) are defined at 33 CFR 83.03(n) and carry Inland Rules provisions the rest of inland water does not: 83.09(a)(ii), 83.14(d), 83.15(b) and the towing-light exception at 83.24(j).
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.