Lake Carnegie (Princeton)

Lake Carnegie is a reservoir that straddles the borders of the towns of Princeton, West Windsor, Plainsboro and South Brunswick in Mercer and Middlesex counties in central New Jersey. The lake was created by construction of a dam along the Millstone River, though the lower portion of the lake actually follows the valley of its largest tributary, the Stony Brook, while the Millstone River crossed under the D&R Canal to the south. The lake is about three miles long, but only about 800 feet wide.

Noted businessman and philanthropist Andrew Carnegie donated money for the construction of the lake, which was donated to Princeton University. Carnegie attended the official opening ceremony on December 5, 1906. In 1990, the Lake Carnegie Historic District was listed on the National Register of Historic Places. Lake Carnegie, which is privately owned, is used by Princeton University's rowing team. Needless to say, stay out of their way! (The Olympic team uses Lake Mercer.)

Fish species include largemouth bass, carp, pickerel, crappie, channel catfish and occasionally a few rainbow and brown trout that make their way into Carnegie Lake from Stony Brook.

Years of pollution have led to a dangerous decrease in the lake's safety levels. The sources of this non-point source pollution are varied - litter, chemicals (fertilizers and pesticides), automotive waste (oil and gas), and goose droppings have all contributed to the decline in water quality. Unsafe levels of mercury in the lake have led to an advisory on fish consumption. Efforts to improve the water quality of Carnegie Lake are ongoing.

The Delaware and Raritan Canal and its associated tow path are situated along the eastern shore of the lake, just minutes away. The canal is about 2 feet higher than the lake. The closest access points are also marked on the map. Lake Carnegie drains north into the Millstone River.


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Lake Lefferts is a man-made lake, the result of the construction in 1928 of Lake Lefferts Dam, which captures and stores the flow of Matawan Creek. This is the nicest spot in northern Monmouth County. The lake is in three parts:

  • The lower part that contains the dam and the launch area and extends up to the Route 34 bridge. This part is fairly deep and free of obstructions.
  • The upper part from Route 34 to Route 516. This part is much shallower and weedy, especially at the far end.
  • An unusable section beyond Route 516. This part is pretty much just mud.

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