23 Feb Luckily for Lake Berryessa, its spillway has yet to see signs of deterioration, and it has become a popular sight-seeing spot for locals. The spillway has a number of nicknames, including the morning glory spillway and the glory hole, although King notes these monikers have become less common since the. 24 Jun Glory holes are used for dam's to drain excess water during dry seasons. This is the largest one of them all in the world, it is located in Lake Berryessa. It is used very rarely, but it is quite the sight to see it being put to use. The Monticello Dam, which holds back Lake Berryessa, features a morning glory spillway. This type of spillway is basically a giant cement funnel. Rather than spilling over the dam, high waters spill into the funnel. Morning glory spillways are also known as bell-mouth spillways. The glory hole seen from afar. The glory hole.
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