in 1960, the IJC implemented a new water regulation plan known as Plan 1958-A. That plan was soon reevaluated due to problems with low water levels, particularly in the Port of Montreal. As part of that evaluation, the International St. Lawrence River Board of Control (Board) -- which the IJC created to help monitor and manage the basin's water levels -- was given authority to deviate from the regulation plan when relief could be provided to one or more interests without causing undue harm to other interests. In 1962, Plan 1958-C became operational, which provided more stable minimum water levels through reductions in summer flows and minimum winter flows.