The Sierra Club and its leader, David Brower, were instrumental in blocking the dam in Dinosaur, ignoring Glen Canyon in the process.
McCalla was already a popular pinup model by 1952, when she and several other models appeared in the film River Goddesses, comprising voluptuous young women frolicking in Glen Canyon.
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During his career, he conducted research and trained students in sites in the Great Basin, the Glen Canyon of the Colorado River, throughout Utah, and in American Samoa.
In detective novel Wet Desert by Gary Hansen, the Glen Canyon Dam is destroyed by environmental terrorists.
His commitment to and involvement in the environmental movement began when he served as a river guide to David Brower, then Executive Director of the Sierra Club, for the Glen Canyon stretch of the Colorado River in the early 1960s.