Learning Resource:

Pandora’s Locks, The Opening of the Great Lakes-St. Lawrence Seaway

Book by Jeff Alexander, published by Michigan State University Press (2011), exploring the issue and implications of invasive species resulting from  a series of locks, canals, and dams that opened the Great Lakes to global shipping.

The book is described by MSU Press, as follows:

The St. Lawrence Seaway was considered one of the world’s greatest engineering achievements when it opened in 1959. The $1 billion project-a series of locks, canals, and dams that tamed the ferocious St. Lawrence River-opened the Great Lakes to the global shipping industry.

Linking ports on lakes Superior, Michigan, Huron, Erie, and Ontario to shipping hubs on the world’s seven seas increased global trade in the Great Lakes region. But it came at an extraordinarily high price. Foreign species that immigrated into the lakes in ocean freighters’ ballast water tanks unleashed a biological shift that reconfigured the world’s largest freshwater ecosystems.

Pandora’s Locks is the story of politicians and engineers who, driven by hubris and handicapped by ignorance, demanded that the Seaway be built at any cost. It is the tragic tale of government agencies that could have prevented ocean freighters from laying waste to the Great Lakes ecosystems, but failed to act until it was too late. Blending science with compelling personal accounts, this book is the first comprehensive account of how inviting transoceanic freighters into North America’s freshwater seas transformed these wondrous lakes.

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The GLFHT is Getting an Upgrade—More to Explore This Summer!

With financial support from America250MI, we are excited to enhance the GLFHT website! We’re delivering a more accessible, user-friendly experience and expanded stories that celebrate fisheries heritage in Michigan and throughout the Great Lakes region.

Some highlights include new trail stories featuring local voices, curated educational resources for youth and educators, additional places to explore in our directory, and more ways to connect with coastal communities through history, culture, and stewardship.

The first phase of the upgraded site launched in June, with more content coming in August 2026. Thank you for visiting!

Great Lakes Fisheries Heritage Trail
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