I'm a bit hard up for material so I'm sort of rotating yesterday's post. There's a similar shot in color if anyone wants to see it. The horizontal pulls in more of the clouds.
There is a fourth small jet off-frame to the right. You can see just a bit of its spray here. Wikipedia says "the four minor fountains represent the four rivers which converge at St. Louis and East St. Louis." So, um, there's the Mississippi, the Missouri, the Illinois just to the north, and the - what? There's a piddly local river at the southern edge of the city coming in from the west called the Meramec but it's nothing to brag about. Someone took poetic license.
Tech tip: you get this dramatic effect of a dark blue sky by using a polarizing filter and rotating it to its darkest position. If you want to go to the trouble, you can also use a CTO (color temperature orange) filter on your lens or do the equivalent in Photoshop or Lightroom.