There were two blast furnaces in Cold Spring. The older, smaller early19th century blast furnace was located under the Rt 9D bridge spanning Foundry Brook, owned by the West Point Foundry and the much larger late 19th furnace was located on the site of Dock Side Park, a few hundred feet north of the gazebo, on the waterfront.
I enjoy your videos, Mike. Interesting, well-put together, you even seem to get the background music right. You should have so many more subscribers / views; this channel is like a 'hidden gem' on You Tube!