Originally Posted by Hydro Junkie

The Snohomish County Parks Department has jurisdiction over a majority of the parks in Snohomish County. To operate R/Cs in the park requires a permit from them, issued before the day of the planned operation. As long as the people participating have the permit available on-site, they are legal to operate their toys. The same goes for school sites. If the school district admins feel it's safe, they give you permission and you're good to go.