Blackinton Bridge, Spanning Hoosic River on Galvin Road, North Adams, Berkshire County, MA
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Spanning Hoosic River on Galvin Road, North Adams, MA
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Documentation compiled after 1968.
Survey number HAER MA-109
Unprocessed field note material exists for this structure (FN-25).
Building/structure dates: 1884 initial construction
Significance: The Blackinton Bridge is an excellent, virtually unaltered example of William O. Douglas's 1885 patent, which he claimed improved upon his earlier (1878) patent for a lenticular truss bridge. The construction date suggests that the Blackinton Bridge may have been one of the first to incorporate the features of Douglas's second patent, including floor-line tension chords and strut braces. The bridge was fabricated and erected by one of New England's most prolific iron bridge builders, the Berlin Iron Bridge Company. Between 1878 and 1895, the company erected well over 600 lenticular trusses in New England and Upstate New York. The Blackinton Bridge is one of approximately fifty lenticular truss bridges to survive nationally, and one of only ten known surviving lenticular truss bridges in Massachusetts (eight of which are under Massachusetts Department of Public Works purview).
Berlin Iron Bridge Company
Historic American Engineering Record (Library of Congress)
1. Elevation of north portal, looking south
2. Closer elevation of north portal, looking south
3. General view of span from river bank, looking northeast
4. General view from deck, looking north
5. Detail of southeast endpost and upper chord connection
6. Detail of bearing shoe at southeast endpost
7. Detail of southwest endpost and builder's plate
8. Detail of web configuration of west truss from deck
9. Detail of lower chord connections from below, looking northeast
10. Veiw of floor system from below deck, looking north
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