Managing water levels in the upper Great Lakes

A five-year study was initiated in 2007 to evaluate options for regulating levels and flows in the upper Great Lakes (Erie, Huron, Michigan, and Superior).  Specifically, the study 1) addresses whether the regulation of Lake Superior outflows can be improved to respond to the evolving needs of users on the upper Great Lakes and 2) examines the physical processes and possible changes taking place in the St. Clair River, and how this is impacting water levels of Lakes Michigan and Huron.

The timeline of the St. Clair River study has been expedited because of concerns over low water levels in Lakes Huron and Michigan.  More than 40 different projects and studies are underway to assess whether the conveyance and morphology (due to sedimentation and erosion) of the St. Clair River has changed since it was dredged in the early 1960s.  Current studies include the collection of depth measurements, videography of the river bottom, and sediment sampling; these data are being used to run hydraulic and sediment transport models.  A draft report on the findings will be released in May, 2009.