Camp Mather to Remain Closed in 2021 Camp Mather, the City-owned family summer camp in the High Sierra wilderness, will remain closed in 2021 due to Covid-19 risks. It is the second summer coronavirus concerns have shuttered the 337-acre site, which hosts about 500 campers and 70 employees each week. The shutdowns were made after extensive consultation with health officials in both San Francisco and Tuolumne counties. The beloved camp, which has served San Franciscans for more than 90 years, faces significant challenges in ensuring social distancing. Campers share bathrooms, meals, and social activities. Camp Mather’s remote location near Yosemite could present an obstacle to medical care during an outbreak. Additionally, the spread of the virus and its uncertain forecast has made it difficult to recruit camp employees.