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LCT has a connector on US 12 in Mobridge (east end, west end).
There is also one at Pierre (west end). Signage on the northbank between Pierre and Chamberlain is very sparse, and this sign implies it's not there, but there is this.
The LCT stays with SD 52 west of Yankton.
I can't find any LCT shields on I-29 south of SD 50, but there is this sign for a wayside exhibit.
LCT has a connector at Washburn (west end, east end).
There is also one on ND 810 in Bismarck (west end, east end). Finally this freeway gets added
LCTKen does not pass thru Kennebec. Instead it uses SD 47 north from Reliance to BIA 10, and presumably goes via Lower Brule to SD 1806.
The Yellowstone Trail also has signs in SD, but I haven't looked into how common they are.
To me, including such routes in a tourist route system is a waste of effort, both for whoever is developing the system, and also potential headaches for the maintainers of the concurrent routes.
(But the route thru Vicksburg should remain in TM as US 61 Business.)
The river - yes - state lines? Once. (With US 10 to connect WI's side properly) - North of that, There isn't a point (signed) to having GRR on each side since it's entirely within a state.I'm supporting a demotion to devel now.
The Great River Road does not cross the river. ever!. There are 2 general routes - one on each bank. You have instances of this crossing (i.e. US 61/151 from Dubuque US 20 to WIS-11)
The GRR National Route crosses the river several times in Minnesota.
Also, there's a spur for the Seaway Trail in Erie following PA 832.
Also the BC routes need to be moved to a cantr system as those are not in the United States.