Harmony Mill No. 3

Harmony Mill No. 3
Mill No. 3 converted to lofts
Location100 N. Mohawk St., Cohoes, New York
Coordinates42°46′54″N 73°42′19″W / 42.78167°N 73.70528°W / 42.78167; -73.70528
Area0 acres (0 ha)
Built1866-1868
ArchitectVan Auken, D.H.
NRHP reference No.71000525
Added to NRHPFebruary 18, 1971

Harmony Mill No. 3, also known as the "Mastodon Mill", is a historic mill located at Cohoes in Albany County, New York. It was built in 1866–1868 and expanded 1871–1872. It is a four-story red brick structure on a stone foundation, with an additional story under the distinctive mansard roof. It features twin six story towers topped by mansard roofs and cast iron grillwork. It was known as the "Mastodon Mill" for the skeleton of a mastodon found while excavating the north section. It is the centerpiece of the Harmony Mills Historic District.

It was listed on the National Register of Historic Places in 1971.