As the level of Lake Powell behind the Glen Canyon dam get dangerously low, this excellent piece (with some spectacular photos) explores what is being revealed, what was lost when the reservoir was filled, and the uncertainty over what is to come.
Is there any precedent for a river basically becoming completely disconnected from its downstream reaches by a dam with stranded intakes?
https://www.hcn.org/issues/55.2/features-water-glen-canyon-revealed