There are many places where a special regulation for a river or stream includes tributaries "above" or "below" a particular landmark. If the tributary more or less parallels the main river, does the entire tributary count based on where it enters the main river?
Here's an example: Let's say a special regulation says:
The main stem of XYX river and tributaries above Miller Bridge is closed to fishing all year.
Now let's say that XYZ river runs due south. There is also a tributary that mostly parallels XYZ river, and empties into it 1 mile below Miller Bridge. Since the tributary empties into the XYZ river below the bridge, does that mean that the entire tributary is open to fishing? Or, can you only fish in the section of the tributary that is south of where it would be even with the bridge (even though the bridge is on the main river, not the tributary)? If the latter, how would you even know when you were past it?