Mount Pleasant Historical Society, Westchester County, New York

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Mount Pleasant Historical Society, Westchester County, New York Our mission is to promote, foster and encourage the study and dissemination of knowledge concerning the history of the Town of Mount Pleasant, New York.

Town of Mount Pleasant 250th Anniversary Celebration Closing Ceremony. See program details in the flyer below
10/23/2026

Town of Mount Pleasant 250th Anniversary Celebration Closing Ceremony. See program details in the flyer below

What our Watermains once were made of
10/19/2026

What our Watermains once were made of

This full-size model of the Kensico Dam’s upper 25 feet allowed engineers to study architectural stonework details. Desi...
09/16/2026

This full-size model of the Kensico Dam’s upper 25 feet allowed engineers to study architectural stonework details. Designed to be admired from afar due to its massive scale, the finished 128-foot-tall dam featured granite blocks intentionally carved with a rough surface. It still impounds water from both the Catskill and Delaware Aqueducts before sending it into the distribution network. July 30, 1912. (Image ID: p005172)

Kensico Reservoir’s “Keeper” lived in a house overlooking the dam. He was responsible for maintaining. The stone house...
09/01/2026

Kensico Reservoir’s “Keeper” lived in a house overlooking the dam.
He was responsible for maintaining. The stone house was built by the Board of Water Supply in 1913. Architectural drawing from contract bid book: July 15, 1912.

From the NYC Bureau of Water Supply Archives.

Photo of New York City Bureau of Water Supply Police taken September 15,1914 in an area to become part of the Kensico Re...
08/18/2026

Photo of New York City Bureau of Water Supply Police taken September 15,1914 in an area to become part of the Kensico Reservoir. Photo from NYCDEP archives.

This poster and description was displayed at the Town's Community Center on July 4th as part of the day's activities. I...
07/07/2026

This poster and description was displayed at the Town's Community Center on July 4th as part of the day's activities. It shows the route across what would become the Town of Mount Pleasant of the capture of Major John Andre, a British officer carrying plans for the capture of West Point, to the Continental Army Outpost at Sands Mills (Armonk).

Something a little different: September 21,1911 photo of concrete forms for constructing conduit to carry excess Kensico...
06/10/2026

Something a little different: September 21,1911 photo of concrete forms for constructing conduit to carry excess Kensico Reservoir water to the Bronx River. Construction of the dam began the next day. Photo from NYCDEP Archives.

This photo was sent to me by a gentlemen named Stan Madyda. The photo is dated 1964 and shows a Hawthorne Youth Basebal...
05/06/2026

This photo was sent to me by a gentlemen named Stan Madyda. The photo is dated 1964 and shows a Hawthorne Youth Baseball Team. The coach on the right is named Bob. Can anyone add information such as where taken, players, etc. Thanks

1960 Aerial Phot of the Hawthorne Circle /Hawthorne Triangle Area
04/30/2026

1960 Aerial Phot of the Hawthorne Circle /
Hawthorne Triangle Area

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One Town Hall Plaza
Valhalla, NY
10595

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