There was a recent Arch picture ready to go for today but I put it aside. While searching my back-up drives for something, I found a zip file labeled "12yearoldarchphotos." It was created in 2010, suggesting the contents were from 1998. This is one of the three pictures I found.
It's not likely it was taken so long ago. I'm pretty sure I got my first digital camera in late 1999 in anticipation of a trip to India and Nepal in early 2000. There is no way to be certain since the EXIF data has been stripped off.
There is only one place where I could have taken this, the Mansion House apartments directly across from the Arch and the park it sits in. Sharon, of Phoenix Daily Photo, lived there when she was working in STL. I've only been inside once, when some friends had serious water damage at home and the insurance company put them up in this building. (Note: if any readers live in or have access to a Mansion House apartment, please please invite me over for tea). Also no way to tell what camera I used. It was probably an early point-n-shoot. I got my first DSLR, a Canon 10D, in 2003. The image looks like a century-old color postcard. Not so bad.