Great Stone Dam
Encyclopedia
Great Stone Dam, built in 1845, is a historic dam on the Merrimack River
Merrimack River
The Merrimack River is a river in the northeastern United States. It rises at the confluence of the Pemigewasset and Winnipesaukee rivers in Franklin, New Hampshire, flows southward into Massachusetts, and then flows northeast until it empties into the Atlantic Ocean at Newburyport...

 & MA 28 in Lawrence, Massachusetts
Lawrence, Massachusetts
Lawrence is a city in Essex County, Massachusetts, United States on the Merrimack River. According to the 2010 U.S. Census, the city had a total population of 76,377. Surrounding communities include Methuen to the north, Andover to the southwest, and North Andover to the southeast. It and Salem are...

.

It was built in 1845 and added to the National Register of Historic Places
National Register of Historic Places
The National Register of Historic Places is the United States government's official list of districts, sites, buildings, structures, and objects deemed worthy of preservation...

in 1977.
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