<p>The South Pier Breakwater Light is located at the end of the South Pier at the Duluth Canal.  The structure is made of brick.  The building was designed to hold a fog signal and the lighthouse itself.  The original fog signal has been removed and was replaced with an electric horn.
</p>
The lantern displays a fixed green light.  The lens itself is 4th order fresnel lens -- the original.  The green color is created by green panels that surround the lens.  The lantern itself has helical bars rather than the usual rectangular windows.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/9197427@N06">Pete Markham</a> from Loretto, USA
CC BY-SA 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/pmarkham/7554090632/">Duluth - South Pier Breakwater Light</a>