With the construction of the dam and lake, tourism was expected to flourish. The Hetch Hetchy Lodge obtained a 20-year lease to operate a lodge and cabins The Lodge was converted into a Dining Hall for the Camp in 1921. The Lodge operated from 1921 to 1923. Promotion of a city camp was led by groups of hikers as early as 1921. In 1923,
Mary Margaret Morgan, the first woman on the San Francisco Playgrounds Commission, The camp then adopted the railroad station name. Polling booths were moved from San Francisco to form the original camp cabins. When San Francisco determined that there would be no water activities on the lake, the tourism dream was abandoned. When the City of San Francisco offered to take over the lease, the company that owned Hetch Hetchy Lodge quickly agreed, which added 22 cabins to the camp. The Carnegie Cabin was built in 1926 for Dr.
Harvey Monroe Hall who conducted studies of growing plants at various elevations. The cabin's elevation of was one of three elevations tested. The Recreation Commission recommended improvements at Camp Mather in the amount of $3.1 million in 1933. Campsites were also introduced prior to 1993. Ten "new", larger lakeside cabins were added in 1955. The 1996 Ackerson Fire, which burned large areas to the north and east of Camp Mather, closed the Camp mid-August that year. In 2003, the Friends of Camp Mather (FoCM) was founded as a not-for-profit organization to support the camp. Camps 1 to 9 were relocated between the summers of 2018 and 2019. A viral outbreak thought to be norovirus affected campers and staff in 2011. The
Rim Fire burned to the edges of Camp Mather in 2013. Only one building was reported lost within the camp. The area which includes the Carnegie Cabin and Hog Ranch Cabin did not burn. The seven-night camp week (Saturday to Saturday) was shortened to a six-night camp week (Sunday to Saturday) in 2016. The camp's operations were impacted by a viral outbreak and the
Ferguson Fire in 2018. Two new single-story staff dormitory buildings were added at the east end of camp in 2019. The camp was closed during the years 2020 and 2021 because of the
COVID-19 pandemic. Weeks 1, 4 and 5 (of 11 scheduled weeks) were lost during the summer of 2022 because of staff COVID-19 outbreaks. Part of an additional week was lost because of smoke from the
Washburn Fire. On July 5, 2024, the 100th birthday of the camp was celebrated. ==Activities==