(Portage) The Columbia County Health Department will be hosting several free walk-in COVID vaccine clinics next week. County health officials say the clinic will be for a one-and-done Johnson and Johnson shot. The J and J vaccine is only offered to those 18 and older. Appointments are not necessary to receive the vaccine but people can schedule ahead time. Those interested in going must stay on site for a 15-minute observation period after receiving the vaccine. Health officials also ask those in attendance to practice social distancing and wear a mask. The clinic will be at the Columbia County Fair located in the Bidwell Building at 1 Fair Boulevard in Portage next Thursday (July 22nd) and Saturday (July 24th) from noon to 6pm. To schedule a vaccine shot visit vaccinate.wi.gov.