BRUNSWICK — On Sept. 6, Bowdoin College will host a roundtable discussion on issues raised in an interactive exhibition on the Androscoggin River now showing at its museum of art.

The program, “A River Lost & Found: The Androscoggin in Time and Place” is open to the public free of charge. It will be at 4:30 p.m. in Kresge Auditorium.

Discussing the complexities of the river’s legacy and its potential will be Anne Whiston Spirn, professor of landscape architecture and planning, Massachusetts Institute of Technology; Martha A. Sandweiss, professor of history, Princeton University; Matthew Klingle, associate professor of history and environmental studies, Bowdoin College; and Michael Kolster, associate professor of art, Bowdoin College.

The Androscoggin River, once devastated by industrial contamination and labeled one of the 10 most polluted rivers in the country, is now partially restored. In their cross-disciplinary research, Bowdoin professors Matthew Klingle, an environmental historian, and Michael Kolster, a photographer, pose important questions about its shifting cultural and economic status in their exhibition.

“A River Lost & Found: The Androscoggin in Time and Place” is on view at the Bowdoin College Museum of Art through Sept. 16. At the center of the exhibition are photographs of the present-day river and its environs produced through a variety of techniques, including 19th-century wet-plate processes. Oral histories and testimonies by local residents revisit the history of the waterway.

The exhibition and Bowdoin Museum of Art will be open until 8:30 p.m. following the roundtable discussion.