I stumbled upon this spot while riding my bike and I stopped for a pee break. There was a door that was barely open. I decided to peek inside and was surprised at how massive the space was. It was punctuated with cement beams. I only had my EDC torch. I took some pics and wanted to come back with a better light, so I only have a couple of bad pictures from that area. There was a cinderblocked-door I was curious to explore. By the time I had gone back, there was a new metal door and a padlock. Although, I did find an inconspicuous entrance to the cinderblocked room. It's a small room with some cables/wires running through. I'm not sure where they start or end. There were also a couple of steel supports.

This is actually the seventh bridge built at the location. It is not a big bridge at all, it just carries a roadway over a tiny creek. The first bridge was built in 1801, washed away a couple years later and was replaced. The bridge was torn down to install a wooden swing bridge. This bridge was torn down because it was not wide enough to accomodate traffic. In the 1880's the wooden swing bridge was replaced with a steel swing bridge. The next bridge was a drawbridge and had a control center in the middle of it. In 1971 the control room operator was forced out of his post by some vandals and they opened the drawbridge, unscrewed the control knobs and ran off into the night causing major traffic delays. The bridge that I visited was built in 1980, and it is just a flat bridge.

https://www.nytime...n-and-boredom.html
https://hiddenwate...decline-in-design/

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I originally saw this door from the other side. When I came back a few weeks later the entrance was sealed up, but I found a way into this tiny room next door.

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These 2 pictures are from the other side of the cinderblocked door. I haven't had a chance to get back in there with some good lights. There's not much to see but I figured I'd post it anyway. There were 4 of these "rows" of support beams. They each went back about a hundred feet or so. I was surprised at how vast the space is. It's cavernous.

Yeah, a lot of bridges have hollow spacing inside to save on construction costs. Sometimes that spacing is used to run electric and water lines across a river if the bridge is over one, but in many cases they're just empty, purposeless space left over after construction that is kept accessible via doors for inspection purposes. Nice find.

Posted by Aran Yeah, a lot of bridges have hollow spacing inside to save on construction costs. Sometimes that spacing is used to run electric and water lines across a river if the bridge is over one, but in many cases they're just empty, purposeless space left over after construction that is kept accessible via doors for inspection purposes. Nice find.

I had no idea that was a thing. Thank you so much for saying this! Now I have to check all bridges near my house.