• In 1970, the Mariposa Grove closed to private vehicles and a free shuttle bus system began in Yosemite Valley.
  • On the July 4th weekend, 1970, a riot occurred in Stoneman Meadow in the Valley.
  • In 1971, the American Indian Council for Mariposa County was founded.
  • In 1971, Sequoia National Park and Yosemite National Park instituted new prescribed burning programs, making them the first places in the United States where park managers honed new fire management policies.
  • In 1971, Yosemite Institute – now NatureBridge – established an environmental education program.
  • In 1972, rangers instituted a wilderness permit system for overnight backpackers.
  • In 1973, a new bear management plan was implemented with an emphasis on trash removal, food storage and public education.
  • In 1976, the Indian Cultural Museum opened.
  • In 1976, Yosemite’s Search and Rescue program was formally established.