Unfortunatly it's the slobs tha ruin it for all of us. It happens in a lot of the outdoor sports. Hunting slobs are responsible for the closure of a lot of hunting lands as well.
I think I may have noticed another victim of this slobbery. I hope I am wrong. Late last week there was a county/dot? crew putting a gate at the trail in to the Snohomish River under the 522 bridge on Elliot Rd. Right now there is no sign, and you can simply walk around it. I live near there and will keep an eye on it to see if they actually restrict access there. It isn't a WDFW site. I believe it is DOT property.