From what I've learned about postcards over the past few months, this card was printed between the 1930s and 1951, because of its white border, the contrasting colors, and the linen finish. I know it was printed before 1952, when stamp cost was raised to two cents instead of a penny.
I'm not even exactly sure of the location, since I'm pretty sure Lock No. 1 along the Monongahela (often called the Mon) no longer exists.
Regardless, I know the city looks nothing like this now. My guess is this was taken from South Side or Mt. Washington. The current Station Square is on distant left, where a booming railroad station once stood, downtown on the right, with what is now Smithfield Street Bridge connecting them.
This postcard was published by the Pittsburgh News Company, and has no description of the scenery.
Even though a lot of aspects of this card remain mysterious, I'm glad I was able to add a few more Pittsburgh cards to my collection.
The image actually makes me think of this place in South Side, off a running trail that runs parallel to the river. There is this huge cement slab, about 10 by 15 feet, hidden behind bushes off the trail that sits along the river. A lot of people called it the slab. It's kind of like a peaceful little place, where you can have a great view of the city, witnessing chaos and craziness, but be in complete peace because it was isolated from everything. I haven't been there in forever, probably since college, but maybe I can seek it out again.
So who's willing to talk about their secret place? ;)