Havasu, Palo Verde Dam, and other dams and reservoirs, as well as riverside lowlands, would be inundated or severely damaged. The resulting flood would scour the bottom few hundred feet of the Grand Canyon. Glen Canyon Dam is the central element of the Colorado River Storage Project. If it failed, the resulting damage could limit or completely cut off water supply to residences or farmlands along the Colorado River, and depending on damage to canal headworks, even cut off water to southern California. References External links Controlled Flooding of the Colorado River in Grand Canyon from Glen Canyon Dam Hydrology analysis of the Colorado River floods of 1983 Glen Glen Canyon National Recreation Area Glen Glen