SAULT STE. MARIE, Mich. -- In the second lockage of the 2012 season, the U.S. Coast Guard Cutter Mackinaw leaves the Poe Lock enroute for the upper river to work on aids to navigation, March 20.   (U.S. Army Corps of Engineers photo by Michelle Hill)
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<p><a rel="nofollow" class="external text" href="https://www.flickr.com/photos/detroit_district/7008577561/">Mackinaw upbound</a>
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