Marin is nearing herd immunity as vaccination rates soar among the highest in the nation and case rates sink to their lowest levels in a year. 

The county is seeing fewer than four cases a day, and only one death has been reported since April 17. On Tuesday, the state moved Marin into the least restrictive tier of reopening, allowing bars to open and indoor capacity to expand. All Covid-19 restrictions, including the mask mandate,…