The 1934 US Route booklet shows US 2 in Vermont going through Grand Isle then after 25 miles to Rouses Pt, NY (no separate paragraph for NY).
Yes, and it was the same on AASHO's 1929 and '42 route logs: "Rouses Point NY" was listed, but it was shown under the "Vermont" heading rather than under "New York", so kind of ambiguous I think.
Whatever video that is is not showing (at least not for me). But based on early topographic maps, the ferry landing on the Vermont side was about equivalent to where Town Hwy 20 meets Windmill Point Rd.
I edited that post so now the animated gif is embedded, but anyway I agree with the location you identified. Based on NE2's post, it looks like the Windmill Point landing is where US 2 ended until at least 1936, more likely 1937 (when the bridge was complete), or possibly even later (I haven't found anything from VT or NY asking AASHO to extend US 2 across the new bridge).
Current US 11 north from Rouses Point was legislated as a state highway (9225) in 1934, and the US 2 bridge approach (SH 1956) in 1936.
https://en.wikipedia.org/wiki/Wikipedia:WikiProject_U.S._Roads/New_York/Resources/Notes_by_county/Clinton
So now I'm wondering if US 9
ever ended at the eastern crossing (QC 223) before it was rerouted to Champlain in 1946. Or did US 9 remain at the western crossing (QC 221), even after US 11 was extended to the eastern crossing in 1934? (as illustrated on
this 1942 map that Mike found).
This 1939 map suggests two US routes going to two different border crossings. So does
this 1940 map.
But then these maps (
1944,
1948, and
1956) all suggest that US 11 did
not make it all the way up to the eastern (QC 223) border crossing, but rather ended at its jct. with US 2.
The 1956 topo and the 1959 Gousha both support that (shown on the bottom of
my Rouses page).