The community of Yankton has two competitive sized swimming pools - one is located indoors at the Summit Activities Center and the other is outdoors at the Huether Family Aquatics Center at Fantle Memorial Park. The Yankton Swim Team utilizes both spaces for competitive swimming tournaments. Both pools are also open to the public. The Summit Activities Center pool also has a water slide, zero entry depth area and other amenities.
There are other swimming pools in town including at the Wellness Center at Avera Sacred Heart Hospital and in many of the hotels (you do have to be a guest or rent the pool area at most).