alt Hacker News> I live next to a State Park.
In what state? Last I knew, the State Parks in most US states were miserably underfunded - so quick fixes (for pretty much anything, not just fences) just ain't gonna happen.
And what's the legal status of the fallen trees? In a fair number of places a 200' tree, already down, might be kinda valuable.
Mostly it doesn't pay to process individual lumber. If it's near a property it may have metal in it, and it's likely wood you can already find at a nearby lumber yard. If it's a particularly beautiful large tree, you have a use for slabs, can rent a skidsteer/forklift, and don't mind waiting a few years for it to season, it can be worth it. Or if you have a hankering for very large boards of unusual wood.