The oldest operational <a href="//commons.wikimedia.org/wiki/Lake_freighter" title="Lake freighter">lake freighter</a>, <i>St. Marys Challenger</i>, built 1906 still carrying loads of cement in 2012
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/53332339@N00">Michael Pereckas</a>
CC BY 2.0
<a href="//commons.wikimedia.org/wiki/Flickr" class="mw-redirect" title="Flickr">Flickr</a>: <a rel="nofollow" class="external text" href="https://www.flickr.com/photos/53332339@N00/7476561230">St. Marys Challenger</a>