Washington: http://www.where-to-ride.info/ (courtesy of WOHVA)
Idaho: http://www.trails.idaho.gov/trails/ (courtesy of Idaho Parks & Rec)
Idaho Panhandle National Forests: http://www.fs.usda.gov/detail/ipnf/maps-pubs/?cid=stelprdb5144787 (Kaniksu and CdA River Ranger districts; St. Joe has yet to publish)
Colville NF: Motor Vehicle Use Map: http://fs.usda.gov/detail/colville/maps-pubs/?cid=fsbdev3_035243
Off-Highway Vehicle Use on the Colville National Forest (pdf file 177 Kb): http://fs.usda.gov/Internet/FSE_DOCUMENTS/fsbdev3_035155.pdf
Colville National Forest Motor Vehicle Use Map User Guide (pdf file 102 Kb): http://fs.usda.gov/Internet/FSE_DOCUMENTS/fsbdev3_035156.pdf