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Over on forum.supercharge.info kevdog114 posted a link to an announcement for a new Supercharger location at the Kum & Go at 715 Lang Creek Ave, Grinnell, IA 50112.
Thanks to Iowa Tesla Club on Facebook, via frnkblk on the supercharge.info forum, for this one:
Kum & Go
5050 NW 2nd St
Des Moines IA 50313
Photos at the supercharge.info forum - New Supercharger in Des Moines
A development plant has been filed to install 8 V3 Superchargers at the Kum & Go at 7450 Federal Boulevard, Westminster, CO 80030. They will be built opposite of Federal behind the convenience store.