Marengo Ridge CampgroundMcHenry County Illinois park campground located on Route 23 between the towns of Marengo and Harvard. It is located in a rural farm setting with large campsites spaced far apart in the woods. State: Illinois City: Rockford Nearest Town: Marengo Status; Official Cost: 10 or less Nearest Road: Paved Scenery Rating: 3 Months Opened: May-October Extras: Water Dump Station Restrooms Number of Camp Sites: 11-29 Max Stay : Unknown -