For more information about the special-use area, call the park office at 636-586-5768. Park Hours Park hours Weather Check Weather Coordinates 38.081807, -90.694483 Park HoursPark Grounds: Sunrise to sunset, year-round. November through March The roads to the upper picnic shelter, pool complex, cabins and the river bottoms are closed to vehicles. They are open to foot traffic. Thunderbird Lodge hours April 1-14 Closed April 15-30 8 a.m. - 5 p.m. daily May through October 8 a.m. to 5 p.m., Sunday through Thursday 8 a.m. to 7 p.m., Friday and Saturday November through March Closed Interpretive Center hoursSunrise to sunset, year-round Park Office hours 8 a.m. to 4:30 p.m., Monday through Friday, year-round. Please note there may be times when the office is closed while staff are working in the park.