I’m at the Springfield Interchange, also called the Mixing Bowl, just outside Washington, DC, a tangle of roads which to me is as bad as an uncrossable bridge, but I’m just going to zoom on through to Maryland, the second of the mid-Atlantic states.
There are 2 uncrossable bridges in Maryland and 1 questionably uncrossable.
The first bridge I encounter is just outside Washington and over the Potomac River and named for the 28th president of the United States. The Woodrow Wilson Bridge crosses from Virginia into Maryland and I learned it’s a bascule bridge – which I didn’t know meant drawbridge. I was over it a couple of months ago >>> I think I could drive over it, but I’m not sure so I’m putting it in a new category – questionably uncrossable.
The next bridge is in Baltimore and I’ve never been over it but I’ve seen it many times while visiting Fort McHenry. It’s the Francis Scott Key Bridge, named for the writer of the National Anthem. This is uncrossable at about 185 feet high. The picture says it all.

The Francis Scott Key Bridge, Baltimore, MD by Patorjk (Own work) [CC BY-SA 4.0] via Wikimedia Commons
Finally, the second uncrossable bridge is the Millard E. Tydings Memorial Bridge over the Susquehanna River. I’ve driven over it even alone but it’s been a long time and I wouldn’t want to do it again. The photo says uncrossable.

The Millard E. Tydings Memorial Bridge, Port Deposit, MD By Famartin (Own work) [CC BY-SA 4.0], via Wikimedia Commons