The Earth Story - THE MORNING GLORY SPILLWAY, AKA "THE GLORY HOLE". The Monticello Dam holds back Lake Berryessa in Napa County, California, USA. The morning glory spillway associated with the dam
California's 'glory hole' activated after weeks of heavy rain at Lake Berryessa reservoir - ABC News
![File:Matthew Warren inspecting the Glory Hole Spillway at Cheney Dam (9662844657).jpg - Wikimedia Commons File:Matthew Warren inspecting the Glory Hole Spillway at Cheney Dam (9662844657).jpg - Wikimedia Commons](https://upload.wikimedia.org/wikipedia/commons/d/da/Matthew_Warren_inspecting_the_Glory_Hole_Spillway_at_Cheney_Dam_%289662844657%29.jpg)
File:Matthew Warren inspecting the Glory Hole Spillway at Cheney Dam (9662844657).jpg - Wikimedia Commons
![Monticello Dam, California ~ The dam's spillway is the largest drain in the world. The Glory Hole is 72 feet (22 m) in di… | Monticello dam, Water architecture, Dam Monticello Dam, California ~ The dam's spillway is the largest drain in the world. The Glory Hole is 72 feet (22 m) in di… | Monticello dam, Water architecture, Dam](https://i.pinimg.com/originals/b7/16/b3/b716b3581f70f2aa3ffd8ffb7c2aaf30.jpg)
Monticello Dam, California ~ The dam's spillway is the largest drain in the world. The Glory Hole is 72 feet (22 m) in di… | Monticello dam, Water architecture, Dam
![Maria Güell i Pons on X: "Play is a deeper part of human nature - Glory Hole is an emergency spillway that prevents dam overtopping by diverting waters downstream. Under dry lake Maria Güell i Pons on X: "Play is a deeper part of human nature - Glory Hole is an emergency spillway that prevents dam overtopping by diverting waters downstream. Under dry lake](https://pbs.twimg.com/media/FGp1OeVWYAUCUIz.jpg:large)
Maria Güell i Pons on X: "Play is a deeper part of human nature - Glory Hole is an emergency spillway that prevents dam overtopping by diverting waters downstream. Under dry lake
![Bureau of Reclamation on X: "Glory hole spillways are engineering marvels that move runoff water through a concrete chamber into the river below with help from a floating steel ring on rack-and-pinion Bureau of Reclamation on X: "Glory hole spillways are engineering marvels that move runoff water through a concrete chamber into the river below with help from a floating steel ring on rack-and-pinion](https://pbs.twimg.com/media/EvK8xHJXcAc1z45.jpg)
Bureau of Reclamation on X: "Glory hole spillways are engineering marvels that move runoff water through a concrete chamber into the river below with help from a floating steel ring on rack-and-pinion
![World's biggest drain hole is terrifying 'portal to the middle of the Earth' - World News - Mirror Online World's biggest drain hole is terrifying 'portal to the middle of the Earth' - World News - Mirror Online](https://i2-prod.mirror.co.uk/incoming/article30612093.ece/ALTERNATES/s1200/0_LakeBerryessaCalifornia.jpg)
World's biggest drain hole is terrifying 'portal to the middle of the Earth' - World News - Mirror Online
![The glory hole spillway at Lake Berryessa, near Napa Valley in California. The spillway is 72 feet in diameter, and the Monticello Dam is 304 feet high. : r/submechanophobia The glory hole spillway at Lake Berryessa, near Napa Valley in California. The spillway is 72 feet in diameter, and the Monticello Dam is 304 feet high. : r/submechanophobia](https://i.redd.it/zixip0i3otn61.jpg)
The glory hole spillway at Lake Berryessa, near Napa Valley in California. The spillway is 72 feet in diameter, and the Monticello Dam is 304 feet high. : r/submechanophobia
![Rt handside (when viewed from the dam) shaft spillway (plug hole) in Ladybower reservoir over flowing after Storms Dudley, Eunice and Franklin, Feb 22 Stock Photo - Alamy Rt handside (when viewed from the dam) shaft spillway (plug hole) in Ladybower reservoir over flowing after Storms Dudley, Eunice and Franklin, Feb 22 Stock Photo - Alamy](https://c8.alamy.com/comp/2HRH7N0/rt-handside-when-viewed-from-the-dam-shaft-spillway-plug-hole-in-ladybower-reservoir-over-flowing-after-storms-dudley-eunice-and-franklin-feb-22-2HRH7N0.jpg)