Great Stone Dam - Credit: Wikimedia Commons
The Great Stone Dam (also called the Lawrence Dam or Lawrence Great Dam) was built between 1845 and 1848 on the site of Bodwell's FallsHistory of the City of Lawrence by Jonathan Franklin Chesley Hayes, 1868, p. 11 on the Merrimack River in what became Lawrence, Massachusetts. The dam has a length of and a height of . Read more on Wikipedia
Source: en.wikipedia.org