If you are here because of "Mendota, IL: CB&Q Coaling Tower and Roundhouse," then you need to go to there.
Monicello Dam: (Satellite)
Spillway: (Satellite)
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| Лариса Юрьевнa drove video, Nov 2023 |
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| jefferson lopez drone video, Apr 2024 |
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| Unique and beautiful posted 🇺🇸🕳️😳 The "Glory Hole" of Lake Berryessa, located in Napa County, California, is a remarkable funnel-shaped opening that functions as a drainage system for the reservoir. Despite its unsettling appearance, this phenomenon is an ingenious hydraulic structure designed to regulate the lake's water levels. Built in the 1950s, the drain connects to an underground tunnel that redirects water into the Putah River. While its primary purpose is technical, the Glory Hole has become a popular tourist attraction due to its impressive design and the mesmerizing spiral motion of water disappearing into its depths. Credits to Cienciatum [Several comments say these are photos of different places. Others, and myself, think it is the same hole.] |
I spent some time looking at Google results trying to find photos of the outlet. I should have first looked at the comments for this post.
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| Daniel Cross commented on the above post People skateboard or used to at the river level exit. |
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| Jason Wells commented on the above post And the other end is skateable. I’ve always wanted to go there. |
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| Ted Kelley commented on the above post The other end is more impressive... |
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| NapaValleyFocus The spillway is designed to handle 48,400cfs or 96,000 acre-feed per day. This flow would be achieved in the unlikely event that the lake level is 15.5' above the spillway rim, which is at 440' msl. The dam is just 0.5' higher. So far, the highest level reached was 446.7' in 1983. |
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| NapaValleyFocus, PeterKilkus Photo The main outlet allows the dam to supply water downstream for irrigation and drinking water. The minimum flow requirement is 45cfs and it can reach 700cfs durng the summer growing season. |
Historic lake levels
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| NapaValleyFocus |
Recent lake levels
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| NapaValleyFocus |
The watershed
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| NapaValleyFocus |
During the 2019 flow:
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| 4:25 video @ 1:18 |
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| @ 4:20 The horizontal tunnel was part of the original diversion tunnel that was used during construction. |
Here we see the spillway outlet on the left and the main outlet further right in the background.
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| Jayson delamora, Mar 2017 |
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| Oscar Omar, Mar 2019 |
A small release from the main outlet. The hydroelectric plant should also be releasing water.
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| Leo Xu, Dec 2024 |
A large release of water out of the main outlet.
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| Christopher Gaczol, Feb 2019 |
And California also has some dry years.
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| Constantia Oomen, Aug 2021 |
A nice overview as a summary.
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| jefferson lopez, Apr 2024 |
When I looked at YouTube a few hours after doing the Google search for the above dam, the YouTube algorithm offered this 6:41 drone video. I'm reminded that Google also owns YouTube. At 2:10, the drone starts flying down into the Glory Hole. I wondered about the drone loosing its signal from the controller. At 2:52, some text appeared confirming that a loss of signal was an issue. But just a few seconds later, it does go down into the hole. Actually, I thinkthe drone went in from the outlet.
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