As part of a larger effort to reduce invasive species on national forest lands the US Forest Service now requires the use of weed-free feed within all Pacific Northwest National Forest land (2009). Weed-free feed includes commercially processed pellets, steamed and rolled grains, or state certified weed-free feed. More information.
Forest Service roads remain open to legally-licensed vehicles operable on all roads in the State of Washington. ATVs do not fit this definition and must remain on designated trails and in areas specifically designated for their use in the Motor Vehicle Use Map or MVUM, which is available free at all forest offices and online at http://1.usa.gov/I4ZIDK.
All Forest Service roads closed by one foot of snow to wheeled-vehicle travel are open to over-snow vehicle use, though seasonal motorized access closures and other forest order closures do apply.