The Sioux City Mariners Swim Team is the oldest swim team in Sioux City, established in 1928. Practices take place at North High School. Team seasons are fall September-March, Spring April-May, and Summer June-July. The Mariners Swim Club is a 501(c)(3) non-profit club that accepts children 7 years old and up. For more information please contact us. We are always welcoming new swimmers.