Search crews to block off, drain portion of waterway in search for missing 4-year-old The New Orleans Advocate and last updated 2021-07-19 17:36:34-04 The search is continuing in Jean Lafitte National Park for 4-year-old Ellis Boudean, who has been missing since Thursday. A Jefferson Parish Sheriff's Office spokesperson confirmed to WWL Monday that the National Park Service has given approval to dam part of the waterway where crews have been concentrating the search to drain it down in the efforts to locate Boudean. The 4-year-old child, who has autism, went missing around 5:30 p.m. Thursday near the Twin Canals trail in the national park. Authorities believe he slipped into the water.