This is a (7) part puzzle cache. The final is part (7). The coordinates listed above are not the location of the cache. So don't go there unless you enjoy swimming in the Meramec River for the heck of it 
.
This is the Series Finale of the critically acclaimed, Emmy Award winning, "21 Cache Street" series. It is a comprehensive tour of Highway 21 between I270 and Hwy141.
Enjoy the show!
The final cache can be found at the following adjusted coordinates:
N38d 27.ABC' W90d 24.DEF'
Each of the (6) additional caches, listed below, will provide one of the missing numbers in the final coordinates. The letter and corresponding number will be located on the underside of the lid written in black ink or written on a piece of paper within the cache (ie, A=5). By the way, that's not the correct value for "A" so don't skip that one 
. Please don't remove the clue.
The final is a large, plastic box and contains a log-book and lots of goodies for the kids.
As a bonus, for the FTF, there is a giftcard to Starbucks. Enjoy!
Each additional cache is large enough for a logbook and some SWAG but please be sure to bring a pen for each one. Some have pens and some don't but pens tend to either disappear or just stop working.
The additional caches are:
21 Cache Street - Episode A (GC6MRTD)
21 Cache Street - Episode B (GC6MRTT)
21 Cache Street - Episode C (GC6MRV0)
21 Cache Street - Episode D (GC6MRV4)
21 Cache Street - Episode E (GC6MRVC)
21 Cache Street - Episode F (GC6MRVK)
Permission, where necessary, for each cache has been granted.
The location of the final SHOULD be accessible 99.5% of the time but the road to it may be closed due to flooding. Even if it is, you can probably still park safely at the "road closed" sign and walk to it. The final also has quite a spectacular view, so, stop and enjoy whilst collecting your SWAG.
There is safe parking near all the caches. Do not park on Hwy 21 for ANY of the stages.
All (6) stages are park-and-grab caches. The final requires a bit more work but you still won't need a machete or bug spray.
You can check your answers for this puzzle on GeoChecker.com.