(ON) CBC - Navigational dredging along the St. Clair River in southwestern Ontario has contributed to a drop in water levels in the upper Great Lakes basin, but it’s not an ongoing problem and doesn’t require immediate action, a panel of U.S. and Canadian experts has found.

Water levels between Lake Michigan and Lake Erie have dropped an average of 23 centimetres between 1963 and 2006, according to a report by the International Upper Great Lakes Study Board. More