Image: USEPA GL collection 148 DuluthAerialLiftBridge

Description: A lake freighter, the Edgar B. Speer, passing under the Duluth Aerial Lift Bridge at the Duluth-Superior harbor in Duluth, Minnesota.
Title: USEPA GL collection 148 DuluthAerialLiftBridge
Credit: United States Environmental Protection Agency - Great Lakes National Program Office image collection. The images were (quoting from the "about" page) developed as a Cooperative Agreement project with Minnesota Sea Grant. A collection originally called Visualizing the Great Lakes - Images of a Region was the starting point for the EPA GLNPO collection these images are sourced from. This particular image was found on the "industry" page of the collection.
Author: US Army Corps of Engineers, unknown photographer
Permission: (quoting from the "restrictions" page) Restrictions for Using USEPA/GLNPO Images: The Great Lakes image collection is in the public domain and CANNOT be copyrighted. Although at present, no fee is charged for using the photos credit MUST be given to the United States Environmental Protection Agency Great Lakes National Program office.
Usage Terms: Public domain
License: Public domain
Attribution Required?: No