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Coast Guard Proposes Replacing Lenses at Duluth Lighthouses

Updated: 05/28/2014 12:24 PM
Created: 05/28/2014 11:53 AM WDIO.com

The U.S. Coast Guard is proposing that Fresnel Classical Lenses be removed from two lighthouses on the Duluth Ship Canal and put on display at a local museum.

The lenses at the Duluth Harbor South Breakwater Outer Light and Duluth Harbor North Pier Light, which stand on opposite sides of the ship canal north of the Aerial Lift Bridge, would be replaced with modern light emitting diode lanterns.  The Coast Guard says the Fresnel Classical Lenses would be removed in order to preserve them; the harsh environmental conditions cause them to slowly deteriorate.

The Coast Guard says the new LED lanterns are more dependable and energy efficient, but have a slightly smaller range.  The range of the south light would be reduced from about 16 nautical miles to 13 nautical miles, while the range of the north light would be reduced from 14 nautical miles to 10.5 nautical miles.

The project would be done this fall in partnership with the Minnesota State Historic Preservation Office.  It has not been determined which museum would house the Fresnel Classical Lenses.

Public comments can be made for the next 30 days by emailing wayne.e.kean@uscg.mil .

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