The Ark Valley Credit Union was formed in 1955 as the Rodeo Credit Union for employees of Maurer-Neuer, Inc. Our Credit Union allows membership to any individual employed or residing in Cowley, Sumner, Elk, Butler, or Chautauqua County. An initial deposit of $5.00 or more opens an account. This gets your share-savings growing and establishes you as a full fledged member.