Carved by South Boulder Creek over billions of years Eldorado Canyon is located just south of Boulder, Colorado hwy 170 off of hwy 93. Eldorado canyon is popular for a wide variety of recreational activities and includes over 500 different rock climbing routes within the park. The walls of the canyon provide unique photographic opportunities due to the unique coloration and contrast in the rocks due to the mineral makeup of the rocks and the gold colored lichen that is growing on the rocks.