Dicey at best in America! Most streamfront properties are privately owned.
Federal Law, not necessarily recognized by state and local law enforcement agencies, gives some guidelines.
Any stream with a naturally maintained width of thirty three (33') feet is a "navigable waterway" and is considered federally controlled.
Those waters should be (?) accessible to the public and within the second bank is open to access.
That said, I tried it once. The landowner wasn't overly impressed with my explanation of "Federal Law"! Needless to say, my "river expedition" was cut short! LOL!
A call to the local sheriff's office supported the landowner's sentiment!
Most private landowners consider their property line as the middle of the stream.