Vaccination clinics in Great Falls next week Alluvion Health is preparing to host another vaccination clinic and last updated 2021-05-14 15:31:43-04 GREAT FALLS â The City-County Health Department in Great Falls says that COVID-19 vaccinations are now available in Cascade County for all people age 12 and older. Following new recommendations from the FDA and CDC, the Pfizer-BioNTech vaccine is available to all persons age 12+. The Moderna and Johnson & Johnson/Janssen vaccines remain available to all persons age 18+. The CCHD and Alluvion Health are teaming up for a two-day walk-in Pfizer vaccination clinic for all persons aged 12 and older. Details are as follows: