|
|
South Central Minnesota | Blue Earth County MN. Downstream being evacuated.
 (Screenshot_20240624_083423_Snapchat (full).jpg)
Attachments
----------------
 Screenshot_20240624_083423_Snapchat (full).jpg (140KB - 171 downloads)
|
|
| |
|
Southeast Colorado | I googled that dam to get an idea of the location.
Ironically a January 2023 story popped up about how the dam had no threat of giving away. |
|
| |
|
East Central South Dakota | More acres of river bottom land on the Minnesota river from Mankato to the twin cities will be lost. Sure hope the traders don't get wind of it, corn will drop another nickel. |
|
| |
|
S MN | Just heard the dam partially gave way now! |
|
| |
|
Roseglen, North Dakota | Only a nickel? |
|
| |
|
southern MN | Oh no. That’s pretty close.
Paul |
|
| |
|
Wisconsin | There's helicopter footage on youtube from the last half hour, looks like the spillway cut down to bedrock. Or maybe there was no spillway? there is one now! The concrete dam itself was intact in the footage, with sunny weather. This has been going on since last night, if it was going to fail it probably would have by now. |
|
| |
|
| Water cutting around a dam is still definitely a dam failure. |
|
| |
|
West of Mpls MN about 50 miles on Hwy 12 | https://www.youtube.com/watch?v=3ySM1CvogFg
https://www.youtube.com/watch?v=Llrsb3yWvQg
Edited by CMN 6/24/2024 12:04
|
|
| |
|
Wisconsin | Yes, it's a failure, and the "spillway" was the substation, so probably the end of the dam, but that will be a political decision, not a collapse or failure of the dam structure itself. Looks like a built up earth approach to the dam that went. |
|
| |
|
east central ND | I wonder how much flow, threw the dam “gatesl, was blocked by the trees and other debris? |
|
| |
|
| https://www.youtube.com/watch?v=D3MM6o2lUZI
The power of water amazes me, watch as the bank erodes. A tree falls in at the 3:30 a house is in jeopardy. |
|
| |
|
southern MN | It’s a bit of an oddity, as there is no lake behind it. The rivers here were formed by glaciers melting off, these rivers near the Minnesota River are cut down into mini versions of the Grand Canyon, very narrow.
So they walled off a canyon area to make electricity in the very early 1900s. Give enough fall for the turbines. But it didn’t create much of a body of water behind it, stacked the water up vertically.
The good news if the dam fails, or just continues to wash out the side, there isn’t such a huge volume of water behind it as a normal dam that creates a large lake.
The bad news is that the dam has had lots of trouble over the past years because it needs to react immediately to any river flow changes. There is no real buffer behind it. What comes in needs to flow out.
They have been pondering a study upon study since 2019 whether to repair/ restore the dam for $18 million or remove it for $82 million.
Looks like they might not need to continue the study.
Paul |
|
| |
|
| Keep pouring concrete it’ll get worse |
|
| |
|
Wisconsin | The video says the dam failure, assuming complete failure, would raise downstream water levels only 2'. Didn't specify how far downstream, assuming the next large city. Looking at the flood footage and the before pics of the dam, the downstream water is up 20-40' compared to normal flow. |
|
| |
|
southern MN | Mankato, 12 miles downstream, had terrible flooding in the 60s. They built a pretty expensive levee in the 70s. It has been tested in the past decade to about 30 feet. Which it probably will get to now.
They are comfortable holding back a flood of 32 feet. They should be fine within that unless something else happens here. There was a thunderstorm just went over them again.
There are provisions with a wall on top of the levee to handle 39 feet of river, but there is some head scratching if that will all work as planned. It looks good on paper, but I’d not want to be on the back side of that thin wall on that tall levee with that much water pressure on it. At the least they need to shore up a lot of bits here and there if the river ever got that high.
More and more roads are closing in southern Minnesota, under water, as the rain water moves into the streams and rivers. State roads, 4 lanes, big roads. This isn’t so much the dam, it is the widespread rain we got for several weeks.
Paul
|
|
| |
Rapidan Dam Breached
