 Berkshire No. 7 is a wood and steel barge constructed in 1935 . It is historically important as a transitional canal barge and as one of the few surviving wooden @-@ hulled canal boats . It was used to transport bulk cargo , including shipping fertilizer , from Connecticut to Long Island Sound . It sank in 1974 along with the Elmer S. Dailey and the Priscilla Dailey . The sunken vessel has deteriorated to the point that a salvage operation could result in breaking it apart . The Berkshire No. 7 was added to the National Register of Historic Places on December 21 , 1978 . 
