Monticello Dam is a foot 93 m high concrete arch dam in Napa County, California , United States , constructed between and Lake Berryessa is currently the seventh-largest man-made lake in California. Water from the reservoir primarily supplies agriculture in the Sacramento Valley downstream. The dam is noted for its classic, uncontrolled morning-glory-type spillway. Locally, the spillway is also known as the "Glory Hole".
Monticello Dam Morning Glory Spillway
Monticello Dam - Wikipedia
An enormous drain hole which looks a portal into another world is especially impressive during the rainy season. The Morning Glory Spillway also called as the Glory Hole by locals is the largest drain in the world. The Monticello Dam can hold up to 2 billions kilolitres of water, but it should be drained. The main role of this spillway is to keep the dam safe and protect it from floods. When the level in the dam rises, the water runs through this huge hole down the concrete pipe at a rate of over 1,, litres per second. The diameter of the hole is almost 22 metres at its widest part, slowly narrowing to the exit to 8,5 metres. The hole can be seen from the adjacent road, but it is cordoned for safety reasons.
Follow our live coverage for the latest news on the coronavirus pandemic. The massive Morning Glory Spillway in the Lake Berryessa reservoir in northern California was originally designed to funnel away water after unusually big storms, and was only expected to flow a couple of times per century when heavy rains filled the lake to capacity. But recent dramatic video and photographs show the circular spillway, known by locals more colourfully as the "glory hole", flowing for the second time in two years, after the brimming lake became too big for its banks. The compelling sight of the metre-wide, metre-long drain in full flow after record recent rains in the area is also reportedly inspiring locals to wax lyrical about what it reminds them of when the water's really pouring through it.
The California floods saw the Oroville dam overflowing , while elsewhere in California excess water became a sight not often seen in this arid part of the western United States. Two years later in February , after a series of storms hit northern California, the epic sight returned to Lake Berryessa. This singular drainage system shaped like a funnel is located in the Monticello Dam, built between and in the Berryessa Valley, in Napa Country. Monticello Dam, with the Morning Glory Hole spillway usbr. Google Maps image of the Glory Hole.