The Missouri River along Nebraska's entire eastern border is Western Rivers water under 33 CFR 83.03(n); Lake McConaughy, on the North Platte, is an impoundment whose classification is an OCMI question rather than something to assume from the watershed. No Part 80 demarcation line is drawn in Nebraska, so everything here is inland water under 83.03(q). For a candidate whose sea time is genuinely Missouri River time, the provisions that differ from the plain Inland Rules are 83.09(a)(ii), 83.14(d), 83.15(b) and 83.24(j), and they are exam material for the inland variant of the Rules of the Road module. Service earned elsewhere should be recorded by the water it was earned on, not by the REC St. Louis address that will process it.
33 CFR Part 80 draws no demarcation line in Nebraska. 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.
Western Rivers (the Missouri River) 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.