…When the Terrace Bay pulp mill opened, an effluent canal was built to connect with Blackbird Creek — a convenient way to send its liquid waste into Lake Superior. It wasn’t until the Great Lakes Water Quality Agreement was signed in 1972 that researchers started to focus on the impact industry was having on the Great Lakes. Following that agreement, in 1987 Jackfish Bay and 42 other sites across the Great Lakes in Canada and the U.S. were officially listed as areas of concern. New guidelines were created for discharging effluent into the Great Lakes and their tributaries, and remedial action plans were proposed. But the use of Blackbird Creek as an effluent canal was grandfathered into the Terrace Bay mill’s operations. When it first opened, the mill owner was entitled to choose where to monitor the receiving environment for its effluent. They chose Moberly Bay, the smaller bay at the mouth of Blackbird Creek, on Jackfish Bay.