Bum luck, I've heard this line of reasoning before, that the state law applies, even down to city and county level. But if that's necessarily always the case, then why do we see, in many posts on the subject, where persons here freely detect city parks, county park, private parks, etc... and "avoid state parks" in their state, because they feel that the state level parks are off-limits. Because if what you're saying is true (that state law filters down to city level), then by logical deduction, all those persons are wrong to be hunting city parks, in their states.
If you looked through the FMDAC list of their state-by-state listing, you would see many states with outright "no's" or .... at least .... dire sounding wording. Yet hunting in city, county, and private locations goes on all the time, with no problem.
So I take exception to your premise that state level laws, for state level parks (or water, in the case of this particular post) "automatically" subrogates down to the city and county parks or waters. For example: state parks may disallow dogs off leash, yet a city park may have no such restriction. Rules differ, from park to park, ALL THE TIME. Closing times, allow or disallow alcahol, over-night camping vs no over-night camping, etc...
What your saying may be true for civil law, like for example, a city can not "allow" murder, since of course, the higher authority (the state and fed) disallow murder. So state and fed. law would "trump" the city law, on something like that. Granted. But for something like md'ing, if what you're saying is true, then you've got oodles of people breaking the law in many states, by hunting their city, their private, and their county parks.
On the contrary: that state by state listing has ALWAYS been interpretted to mean state level, not city or county. But the legal angle your taking, interprets that it means EVERYTHING in the state, right?