The 1785 compact itself is a fascinating story, as representatives of the two states met (at Washington’s invitation, of course) at Mount Vernon to hash it out, and the example of successful resolution of an intercolonial dispute spurred Washington and others to agitate for a broader convention to revise the Articles of Confederation.
I’m glad to hear that Virginia won and that the compact is still in force!
If it moves by accretion, the boundary moves with it. If it moves by avulsion (e.g., a flood event), then the boundary stays the same.
And yes, the Mississippi River gives us some interesting examples, especially around the area where Tennessee, Missouri and Arkansas all get together. :eek:
And as for the interesting case regarding the Potomac River, see VIRGINIA v. MARYLAND (pdf) Or read it here. (website).
Boundary determined to be the “low-water mark on the northerly side of the Ohio River as it existed in the year 1792,” rather than the river’s northerly low-water mark “as it exists from time to time.”
Rejected Kentucky’s defenses based on “principles of riparian boundaries, including accretion, erosion and avulsion” and found that the construction of dams on the river had caused the present low-water mark on the Illinois side to be farther north than it was in 1792.
I had the impression on the times when I’ve walked across the Ohio River (on bridges, not walking on water) that the boundary was on the Kentucky shore. However, Illinois v. Kentucky, cited by Dinsdale, shows that I was wrong in that.
I stopped relying on state-erected signs for reliable border info as a child, when I noticed how infrequently the signs on either side of the expressway for the states you are leaving/entering were directly across from each other.
In Covington, KY, across from Cincy, the wall on the S side of the river used to say “Mason-Dixon Line” in huge letters, creating the impression that the wall was on the line.
Yes indeed, when Virginia ceded its northwestern claims to the federal government in 1784, it was careful to cede the territory “lying and being to the northwest of the river Ohio”, and not the river itself. (Kentucky and West Virginia were later hived off from Virginia and inherited the boundary.)
As a result Blennerhassett Island, which lies within the river, composed part of the state of Virginia, which meant that when Aaron Burr was accused of committing treason there, his trial took place in Richmond with John Marshall riding circuit instead of some run-of-the-mill Associate Justice. River boundaries have consequences!
Yes, the western end of the Mason-Dixon line is where the southern boundary of Marshall County WV and the northern boundary of Wetzel County WV hit the boundary of the State of Ohio. (And it’s off the Ohio shore, because the river is higher than it was when the boundary was set, since there is a dam and lock about 5 miles downstream of there).