The Cliffs OHV Park
Cliffs Insane Terrain is a 270-acre Illinois DNR grant-assisted off-highway vehicle park in LaSalle County, near the Illinois River in northeast Illinois. The facility offers some of the most technically demanding terrain in the Illinois OHV system: rocky creek crossings over exposed dolomite and limestone bedrock, engineered deep water holes, mud bogs, open field sections for higher-speed ATV riding, forested trail corridors, and rock crawling sections that exploit the natural Illinois River valley geology. The combination of surface types in one park is unusual for Illinois, where most other grant parks emphasize either trail riding or motocross rather than technical obstacle terrain. Dirt bikes, ATVs, and UTVs are all permitted; full-size jeeps and trucks are explicitly not permitted per the IDNR grant conditions governing the property, which distinguishes it from the southern Illinois parks. Day-use fees apply; an IDNR OHV sticker is required. Located in the Illinois River valley corridor northwest of Ottawa and northeast of Peru, Cliffs Insane Terrain serves the Joliet, Rockford, and Chicago southwest suburb markets alongside riders from the greater LaSalle County area.