Lake Innisfree, reservoir in New Rochelle, New York

Lake Innisfree is a man-made lake and former reservoir in New Rochelle and Eastchester, New York, formed in 1885 by the New Rochelle Reservoir No. 1 Dam on the Hutchinson River. The masonry and earthen dam stands 34 feet high and 680 feet long, impounding a 65-acre water surface with a capacity of about 271.7 million US gallons.

The lake was built in the late 1800s to supply drinking water to nearby towns and served as a reservoir for decades. In the 1930s it was renamed after a poem and a sandy beach was added for recreation as the surrounding farmland was developed into neighborhoods.

The name comes from W. B. Yeats's poem "The Lake Isle of Innisfree"; the developer of the adjacent Interlaken Cooperative coined it in the 1930s and laid out a sandy beach for recreation. The lake is also called Lake Isle or Interlaken, and originally Reservoir No. 1.

The lake's eastern end abuts the Hutchinson River Parkway, and the masonry-and-earth dam on the Hutchinson River can be viewed from the road crossing it. The water surface covers about 65 acres, so the shoreline is long enough for a walk between the New Rochelle and Eastchester banks.

The reservoir was named Lake Innisfree in the 1930s by the developer of the adjacent Interlaken Cooperative, who took the name from W. B. Yeats's poem The Lake Isle of Innisfree and built a sandy beach beside the water. In 2022, Eastchester took ownership of the central portion of the dam.