Carnegie Lake in Princeton was formed by a dam that was built on the Millstone River starting in 1903. It was inaugurated three years later in December 1906.
Today was a cloudy and somber day, but I decided to walk to the dam and brought my camera along just in case. The colors were not there, except at the locks by the dam where the lake spilled onto the river.
and here are the locks.
Finally, a closer look at one of the locks.