Bathers swim at Bay Beach, June 20, 1943. Swimming was a popular activity at Bay Beach during the early part of the 20th century. Swimming suits, the use of the bathhouse, and a towel could be rented at the park for 25 cents, leading more than 1000 people to use the beach on hot days. However, by 1933, increasing pollution began causing skin sores and the beach was forced to close. Many residents continued to swim until ten years later when the Green Bay Board of Health began to enforce the closure and the beach was finally abandoned.