The image is an excerpt from this research paper:

Magilligan, F. & Sneddon, Chris & Fox, C… (2017). The Social, Historical, and Institutional Contingencies of Dam Removal. Environmental Management. 59. 10.1007/s00267-017-0835-2.

This article from Dartmouth College gives more information. There are over 14,000 dams in New England, mostly small structures leftover from old industry.