According to the Village of Ossining Downtown Walking Tour:

The Double Arches site consists of two bridges spanning the Sing Sing Kill: the 1842 Old Croton Aqueduct bridge and the 1862 Broadway Bridge. The 88-foot Old Croton Aqueduct Bridge traverses the gorge at a level 100 feet above the stream. The bridge was designed by well-known 19th century civil engineer John B. Jervis and built for a cost of $90,685 in 1837 dollars. In the early 1860s, the Broadway Bridge was built to replace a smaller wooden span that was inaccessible to horse-drawn vehicles. The new structure was also built of stone masonry and extends east-west over the Kill Brook. In the early 20th century, the bridges’ similar design and stone construction prompted the community to bestow the site with the name ‘Double Arches’. The image of the Double Arches was later adopted as the seal for the Town of Ossining.

Taken with a Sony RX-100 M3.

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