First, it is not "state run". It's simply a self serve range that the state allows the public to use. I haven't been there in a number of years, but it was never that bad when I went by. Yes, there are a lot of shells laying on the ground. I assume that it's cleaned up every so often. Apparently not enough for you. It should also be mentioned that the road it's on is almost exclusively traveled by people hunting back there. It's hardly a State Route, or even a County road. Perhaps things are worse than they use to be, though this close to gun season it's not all that surprising. It will be a mad house this coming weekend.
This really belongs in the Midwest section. Not sure this has anything to do with "Wildlife Management".