An update to the process of updating a 100-year-old water treaty on the Milk and St. Mary’s rivers will be given in early May, officials have announced. Two years ago the International St. Mary and Milk Rivers Study Board began reviewing the Canada-U.S. Agreement, which has been in place since 1921. It aims to update the pact, look at options to “improve access to apportionment,” and mitigate the potential effect of climate change on water supply.