Biological Opinion on Operation of Glen Canyon Dam

This biological opinion is in response to the proposed action to operate Glen Canyon Dam according to critera of the Modified Low Fluctuating Flow Alternative, selected in the final environmental impact statement. Read the opinion ›

Biological opinion on Glen Canyon Dam

Download the pdf ›

Related Resources

Dragon Bravo Fire Map showing the locations and burn perimeters of the White Sage and Dragon Bravo wildfires in 2025 near Grand Canyon National Park and Kaibab National Forest, with affected areas shaded in orange.
See a map of the areas the Dragon Bravo and White Sage fires burned on the north rim of the Grand Canyon in the summer of 2025, destroying the lodge and numerous other park buildings.