Between 1988 and 1996 , the Reserve was co-managed by both NPS and IDPR .
All lands owned by the United States within the Reserve boundaries were placed under the authority of the National Park Service ( NPS ) .
Between 1988 and 1996 , the Reserve was co-managed by both NPS and IDPR .
All lands owned by the United States within the Reserve boundaries were placed under the authority of the National Park Service ( NPS ) .