Conservationists accused the NPS of 'industrial tourism.' The resulting fury gave us the Wilderness Act of 1964, a direct repudiation of Mission 66.
The environmental movement know it was partly born from outrage at Mission 66. The backlash produced permanent legal protections for American wilderness.
The NPS's founding mandate contains an impossible paradox: conserve the scenery unimpaired while simultaneously providing for public enjoyment. Mission 66 pushed this tension to its breaking point.
Conservation groups, the Sierra Club and the Wilderness Society, were excluded from Mission 66's secretive planning. As billion-dollar concrete infrastructure began appearing across pristine landscapes, they organized fierce opposition.
Under David Brower, the Sierra Club transformed from a polite mountaineering society into a politically potent advocacy organization. Brower believed the NPS was succumbing to "industrial tourism," prioritizing motorist convenience over ecosystem sanctity.
Ansel Adams specifically critiqued the architecture. He argued that Mission 66 was "built upon a definition which justifies the urge to expand and to manage" rather than one based in wilderness and reverence.
The blasting of Yosemite's Tioga Road became the primary flashpoint. Brower viewed the dynamiting of glacial granite to accommodate speeding sedans. The historic alliance between the NPS and conservationists shattered.
The outrage produced permanent consequences. Fearful that the NPS would pave the last primitive areas for motels and parking lots, conservationists lobbied Congress to remove agency discretion over undeveloped lands.
The result: the Wilderness Act of 1964. It defined "wilderness" "untrammeled by man" and prohibited roads, commercial enterprises, and motorized access. It was a statutory repudiation of everything Mission 66 stood for.
In 1958, at the height of Mission 66, the NPS employed only two wildlife biologists system-wide. Following the backlash, Conrad Wirth resigned in 1964, effectively ending the era of unbridled development and ushering in management guided by ecological science.
Ansel Adams argued that the massive glass picture windows actually alienated tourists from nature, creating a sterile 'urbanized' terrarium that replaced spiritual reverence with television-like viewing.