Cover : As many as seven concentrations of water colorants are visible in this spectacular photograph of the point where Lake Huron empties into the St. Clair River between Port Huron, Michigan, on the left and Sarina, Ontario, on the right. The brown tones toward the Michigan side of the river are the result of silty clay material eroded from the Lake Huron shoreline. The dark middle of the channel is the relatively clear water from the open lake. The white tones along the Ontario shoreline are created by suspended rock material from a concrete operation. The St. Clair River connects the upper Great Lakes and Lake Erie. Photo by John Lyon, Ohio State University.