Modern Route 10 overlaid on the old Arietta – Piseco Road (1954)

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New York Route 10 is often said to be the last paved state highway in New York when the Glen Harris Highway was paved north of Arietta up through Piseco Lake in the early 1980s.

Due to constitutional constraints relating to the road running through forest preserve, with few exceptions, almost all of modern asphalt road follows the path of the dirt road, although during construction they did bank the curves and widen the road slightly from the horse and buggy road that existed in almost the same form since the 1800s.

I have the 1904 topographic maps of the area too but due to issues with the original map survey, the overlay is more difficult to do accurately compared to the more modern 1954 survey. 

The modern alignment is shown in orange while the topographic map below is from 1954.

Modern Route 10 overlaid on the old Arietta - Piseco Road (1954)

Lake Washington

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Lake Washington was expanded and put into service as a reservoir in 1907, although it had been providing water to its predecessor, Monell's Pond, since 1852. The dam has been raised many times since then to increase capacity.

In 2016 the city briefly declared a water emergency and started using Browns Pond, its backup supply, when levels of perfluorooctane sulfonate (PFOS) near the federal Environmental Protection Agency guidelines of 200 parts per trillion (ppt) were found in the lake. A pond on the Stewart Air Guard Base from which Silver Stream, one of Lake Washington's tributaries, rises, had levels of 5,900 ppt.