Celebrating Ossining's Double Arch Celebrating Ossining's Double Arch This post celebrates the restoration of Ossining's famous Double Arch promenade, which reopened on Saturday, July 20, 2013. The Double Arch is a granite aqueduct structure spanning the Sing Sing Kill. In 1839, the Westchester Herald called it "the most astonishing specimen of the art and ability of man to be seen in this secti…