I found the free time to go on another siren drive, this time to Nevada, MO, to see their system. On the map I refer to it was noted to have 2 STH-10s, 3 Allertors, and 1 2t22.
However, I'm not sure why it wasn't noted, there's a 4th Allertor to their system! Located here: https://goo.gl/maps/55Ms8P1cNUr Seems like it's always been a part of their system, not sure why it was left off the map. Maybe inactive? Unsure since I'm not local.
Here's some photos I took! Kinda fuzzy, sorry, it was the middle of the night and I was just using a cell phone.
Kinda can see the paint chipping in the center of it here. Not sure how old they are, but it was still really awesome to see. Love that sky blue paint they used on it!
4 on the box! Only three locations were marked on the map