I was here to look at the bridge, so I wanted to avoid the $2 per person entrance fee. I parked just before the ticket booth and walked up towards the bridge. The sandy shore along the river looked inviting on this warm August day and I could hear the delighted screams of young people who were playing down there by the water. I was here to take pictures though, so I walked closer to the bridge, carefully watching for traffic. The road was very busy with cars coming and going, but thankfully everyone was courteous and took their time passing me. It was a nice time of day, with the lowering sun causing interesting shadows on the bridge and sparkles glistening on the water below it.The only disappointment for me was that the informational signs about the bridge that used to be near the ranger station are no longer there. I intentionally looked for them and knew where they had been because of a description about them that I read for a virtual geocache, which is here. Also, there is a pokestop here that shows a photo of the signs and where they were in relation to the ticket booth/ranger station. I hope that this is only temporary and that the signs will soon be replaced with new ones so that others may learn about the history of this old, but really cool (and still functioning) railroad bridge.I saw two trains cross over the bridge in the short time that I was there. Pretty exciting!

So big! but was disappointed that so much of it was obscured by trees. it also was not well- marked as a historic site.

Old stone bridge that can be seen in many places. Not that unique in design or impressive. It is the first things to see when you enter the park. There is no parking next to it.

This a great example of a stone arch train bridge. It was the first one that wasnt straight. It has a curve which was needed for the location but also provide extra stability. The bridge crosses the river and what is now a state park so you can see it from below, surrounded by nature much as it would have been soon after it was built. It was an extra treat for a train to cross it while I was there.

Great local fishing spot for sunfish plus hiking in the Patapsco State Park.

Wish the railroads would clean grafitti from the monument and have a historical sign.

Beautiful day and the park was grand! Wishing I had brought swim shoes so I could stroll in the water. Looking forward to a another trip to explore the trails.

Nice place to walk

Beautiful views. Relatively easy hiking unless you choose otherwise. Beautiful place to visit

Good fishing hole!... js

Thomas Viaduct is a very picturesque structure!

Work right by this nice veiw

Great trails and great pics for railfans.

Great picnic and playground. Room to walk and close to river

An amazing structure built back in the early days of railroad. You can still go over it on the MARC train from the inner harbor.. a true experience

Built around the time the railroad was considering steam engines to replace horses. In daily use for commuter and heavy freight. When E.F. Baldwins father sent him to Europe to study architecture, he studied cathedrals. His bridges and stations look that way. He also did the marc station in Laurel.

Great trails.

I born and raised in Relay. Arlington Avenue.

Interesting historic stone arches.

Brian FBI

This is amazing to see up close, from underneath, and up at the top. An amazing engineering accomplishment predating the Civil War, and still being used today.

Awesome hike spot super close to Baltimore

Great spot to catch Csx trains on the capital subdivision. Also its not far to the Marc saint Dennis train station where Csx also passes by.

Passing by while cycling in Patapsco. Trails are closed still due to damage from rain and flooding :(

What a thing of engineering beauty.

Dont go to the top, or to the monument as that is trespassing, and the neighbors will call the cops on you, and you could be arrested. Ah, history.

Amazing structure

Best viaduct in town!

I like this school...