Sleeping Bear Dunes National Lakeshore officials worry that the Platte River party scene has reached a pitch where, if left unchecked, could spell disaster: a child cutting their feet on a broken beer bottle; a drunken reveler passing out and drowning in the river, a pedestrian hit by a moving vehicle on Lake Michigan Road, where the speed limit remains 55 miles per hour—even near the mouth of the river where cars line the road for half a mile on hot summer weekends.