Kansas gets a narrow answer and it is worth stating narrowly. The Missouri River clips the state's northeastern corner and is Western Rivers water under 33 CFR 83.03(n); nothing else in Kansas is classed that way here. Milford Lake and Wilson Lake sit on the Republican and the Saline, well up the Kansas River system, and while every drop of that eventually reaches the Mississippi, "eventually reaches" is not what 83.03(n) says — the reach a reservoir sits on is what the cognizant Officer in Charge, Marine Inspection rules on. Absent that ruling they are plain inland water under 83.03(q), with no Part 80 line anywhere in the state. For most Kansas applicants the underlying sea time was earned on salt water in another life, and the useful discipline is a record that names each water plainly enough that REC St. Louis never has to guess which regime it fell under.
33 CFR Part 80 draws no demarcation line in Kansas. 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.