Under Federal Law we are able to use any Navigable waterway for any purpose that we want because it belongs to the public. So the question is what is Navigable and Non Navigable?
Here is a Paragraph from something i found followed by the whole article.
"Judge Lokuta wrote that "the question as to whether the Lehigh River [or any other water of the Commonwealth] may be considered to be navigable cannot, in the Court's opinion, be resolved by merely observing the river in its present state of being." At issue was whether, when the United States declared independence on July 4, 1776, the Lehigh was considered a navigable waterway, and capable of use by the public for transportation and commerce. Uses accepted in the doctrine of navigability include fishing and boating."
http://www.fish.state.pa.us/anglerboate ... hicort.htm
You can never fish the same river twice, by the time you get back it's not the same river.
Matt