This lighthouse is the last of the three lighthouses to be built in Duluth to make the Duluth ship canal.  It is a cast iron tower over a skeletal frame and has a foundation of concrete.  Originally, it was equipped with a 5th order fresnel lens and contained an electric lamp.  The lens is still in place, but it has been surrounded with a red screen that changes the color of the light from a white light to a red light.
<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/6403603999/">Duluth North Pier Lighthouse - Fall 2011</a>