The information one can get via Wikipedia is gold. I was looking up something on New Castle, Delaware, and found this interesting tidbit:
The spire on top of the Court House, Delaware's Colonial capitol and first state house, was used as the center of the Twelve-Mile Circle forming the northern boundary of Delaware. The Delaware River within this radius to the low water mark on the opposite shore is part of Delaware. Thus the Delaware Memorial Bridge was built as an intrastate span by Delaware, without financial participation by neighboring New Jersey.
For this to be even remotely true, the bridge would have had to touch down at the exact point where the river touches NJ during lowtide. Obviously, it does not.
Take note that a citation is needed...I won't hold my breath waiting for that citation to be provided.