This is an 8-site city-owned/operated campground best suited for self-contained RVs because the bathrooms are in a different area of the park. Call the Fire Department to make reservations, though on a summer weekend there were still vacancies. Sites are open and grassy with picnic tables and fire pits. There's an additional small parking lot nearby. There are steps down to a picnic area and boat launch on the St John River.
Riverside Park also serves as the eastern terminus of the Northern Forest Canoe Trail, running 740 miles between Fort Kent, ME and Old Forge, NH. On land there are miles of walking and ski trails. Fort Kent is home to an original blockhouse from the 1830s-40s Aroostock war over the border of Maine.