KRUSER I will PM you this evening.
Okay!
The city North 800 MHz site is simulcast for sure. It always has been in order to get coverage in south and north city after they went to the P25 system. I don't recall what they did when it was the old analog Motorola smartnet system.
Back in the early P25 system days (before they even called it a Moswin site), I had to aim my corner reflector antenna at the Union tower in order to avoid simulcast issues with the Sublette tower!
I later switched to a yagi and solved any problems I still had.
Click that link I posted a few posts up and you will see the three tower sites. The tower sites all use the same frequencies indicating simulcast.
Here's the map again showing the STL City North site tower locations.
FCC Callsign KNJH492 (Board of Police Commissioners of the Metropolitan Police Department of the City of St. Louis)
I also believe you are correct in that the Clark site is off the air these days but the tower up on Union and the tower at Sublette are both on the air for sure which makes it a simulcast site.
For some reason, I think I recall someone saying the Clark tower can be turned on as a backup to the Sublette tower but that could have been something I heard way back in the days when they announced the were building the new "superstation" at Sublette. Do you remember when they called it a Super Station when they announced its construction there on Sublette?
None of the VHF Moswin sites are simulcast that I'm aware of. I'm not sure if any of the newer 700 MHz sites they have been lighting up across the state are simulcast either but the ones I checked in St Clair and Washington, MO were both single tower non-simulcast 700 MHz sites.
Oh well, shoot me a PM later when you are rested from working!
Edit: I forgot but the site at Lambert Airport is also listed as a simulcast site.
Someone recently asked if it really was but I don't know the true answer. The sites license shows three locations but only the far West and mid-East locations 1 and 4 are tower sites. Site 3 is listed as mobile use on the actual FCC license. It could be a possible site on wheels maybe (SOW)? I have no idea if sites 1 and 4 are both active at Lambert or not. As open as the airport is, you would not think they would need a simulcast system there but maybe so in order to cover inside the terminal buildings from tower site 1. You can see the tower sites at this link for Lambert's 800 MHz site:
FCC Callsign WPEU462 (Saint Louis Lambert International Airport)