Henrys Lake County ParkCounty park on west side of Henry’s Lake off Highway 20 and State Highway 87 west of West Yellowstone. Free, no services. Great views. State: Idaho City: West Yellowstone Nearest Town: Island Park Status; Official Cost: Free Nearest Road: Paved Scenery Rating: 5 Months Opened: Unknown Extras: Restrooms Number of Camp Sites: 10 or less Max Stay : 10 -