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Chris Daniel
United States
Приєднався 7 чер 2006
Just a guy
Rapidan Dam - August 23, 2024
Updated video from Rapidan Dam, taken Friday, August 23, 2024.
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Відео
Rapidan Dam - August 2, 2024
Переглядів 29 тис.Місяць тому
Updated drone video from the Rapidan Dam, taken the afternoon of August 2, 2024. Includes some closer footage of the County Road 9 bridge, built in the 1980s. The Blue Earth County Public Works Director, Ryan Thilges, says bridge repairs are not feasible, so it will likely need to be replaced. Source - Mankato Free Press: www.mankatofreepress.com/news/local_news/bridge-by-dam-to-be-removed-rebu...
Rapidan Dam - July 12, 2024
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(Southwest of Mankato, Minnesota.) After the failure of the left bank caused by the 2024 floods
Camp Nenookaasi - eviction January 30, 2024
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Second eviction in a single month of the same group of people. 25th or 30th encampment in the Phillips neighborhood of Minneapolis since summer 2020. Second encampment on this spot. Count the police squad cars. Realize for every 3 or 4 of them, there is at least 1 more unmarked in the neighborhood. Notice the police bikes lined up. Most or all of these officers are on overtime. Think about the ...
Speed construction
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Modular housing construction in Minneapolis, MN This is a new multi-family public housing development by Minneapolis Public Housing Authority (MPHA) in Midtown Phillips.
Loram Rail Grinder on Tri-Met MAX tracks 2
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From Broadway Bridge. Here is Loram's page on their light rail grinding service: www.loram.com/services/default.aspx?id=264 According to Tri-Met, the entire MAX rail system requires grinding once every 3 years. In order to grind a third of the system, 20 days of overnight 6-hour grinding shifts are required.
Loram Rail Grinder on Tri-Met MAX tracks
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On Interstate Avenue, near the Broadway Bridge. Here is Loram's page on their light rail grinding service: www.loram.com/services/default.aspx?id=264 According to Tri-Met, the entire MAX rail system requires grinding once every 3 years. In order to grind a third of the system, 20 days of overnight 6-hour grinding shifts are required.
Unisonic 1011 calculator (~1972)
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Unisonic 1011 calculator that I found at the Goodwill "bins" in Hillsboro. I used one of my universal AC adapters because the one it came with was apparently broken. 3V, 300mA although I think the original supply was only 100mA. I just like this calculator because of the metal finish, the glowing VFD, and the fact I can use it without batteries. It can use 4 AAA batteries, though.
Conar Model 250 Oscilloscope
Переглядів 1,6 тис.15 років тому
I got this for $5 at the Goodwill "bins". It is from somewhere around 1964. Showing the waveform of some audio from my speaker system.
tear the dam down and repair the rest. why are they waiting so long to do anything.?.
and the river keeps on flowing......................beautiful
ゲートの高さに比べ堤頂が低すぎるな、というのが洪水災害が多い日本から見たこのダムの印象です。堤頂に全面設置したクレストゲートでの調整は日本のダムでも採用されていますが、それとは別に非常用洪水吐きを設置すると共に、流木を阻止するスクリーンも設置し、ゲートに流木が引っかからないような設計を取ります。設計不良から起きた災害ではないかと思います。
I'm surprised this dam didn't have an emergency spillway and agree it was poorly designed.
Very good footage. I was wandering how does it look like now, thanks a lot.
Looking at this scene, I remembered my country again, in 2021 we had a dam upstream, the rain and flood caused the dam to burst, putting our people in danger, we were isolated by flood water for 3 days in a row, it was really a terrible memory 😢😢😢
They just need to remove it. Let nature have the landscape back!
Nature has been shouting F U and flipping the bird to a lot of dams over the last two years.
Thanks for the video update. Great visualization of why they had to close the bridge. The whole situation is disappointing - the dam and bridge are monuments to bureaucracy.
As big as this flood was concerned every big strata line in the exposed sides is rubble and sediment that moved into place during a much much larger flood sometime in the distant past.
Pretty cool isn't it? Even the bedrock here (Jordan sandstone) is relatively young sedimentary rock, thought to have been deposited by an ocean covering most of North America. en.wikipedia.org/wiki/Jordan_Formation And then you have a bunch of glacial scour and melt happening over the top of that. Definitely hard to get good a sense of what is rock vs. overburden from these videos. But the big new cut on the west side of the dam took away a *lot* of that easily erodible sandstone where it used to be a much narrower valley.
that center pier on the bridge is toast, wondering what the plans are for demoing the old dam and/or fixing the bridge
Seems to me the pier could be rebuilt without destroying the whole bridge. Crib the bridge up on both sides with temporary supports and rebuilt the pier.
@@ericpaul4575 The issue, as another commenter has mentioned, is that the bridge as built, relied on the impounded sediment behind the dam to partially carry the load. Now that that has been washed out from under one pier and presumably settled under the others, this puts the integrity of the structure in question. Even if the support was cribbed in, there would always be a danger of eventual failure. From the government's perspective, the safest option is the construction of a new bridge.
Going to need a ton of Flex Seal because that's a lot of "dam"age
Wow that bridge pier is done for, too.
I am surprised that the State hasn't hire a demo crew yet.
Just to clarify, the road the bridge in question carries is Blue Earth County Road 9. I believe this means responsibility for the bridge is with the county, not the state.
@@cj_daniel Thanks for the clarification.
I would need to know the depth of those steel piles before I condemn it, but it looks well nasty. If they are deep they will concrete back in.
@@teamidris Still to be determined. But, on August 27, the county commissioners directed the public works staff (at the staff's recommendation) to work toward removal of the bridge, to be replaced with a new design and probably different alignment of the road. Probably more detail than anyone is interested in, but: the current bridge was designed to use the sediment impounded behind the dam in bearing the load. In addition, the county public works director expressed a preference in the August 27 meeting for piers of the new bridge to be out of the river, so that the county doesn't have to continually remove debris.
Very nice video Chris. The 4K looks very sharp on my 28" monitor! The power of water is amazing!
Amazing what mother nature is capable of undoing that what man can build . Best regards from Chicago
it's more like a Rapidan Bypass...than a dam
How often do you think you will go out there to update?
I may go again this weekend. Not sure how often I will go -- that may depend on how fast they get around to doing any work there. I am certainly interested in how things progress from here.
@@cj_daniel Subscribed! Appreciate you taking the time to head out there and showing us all what’s the state of the dam, bridge and river currently is
Its crazy to me that they tore that house down because "incase it fell into the river, to prevent more trash" but then they left all the trash there to fall in anyway?
I’m glad the dam near me in Manawa will be rebuilt! Hopefully this one in Minnesota will be as well! I was a witness of the flooding in Manawa and saw the flood take 3 cars.
Thanks for a great video. I've worked on bridges over the last few decades which were undercut worse than this and were repaired rather than replaced. However, with stricter environmental laws now in place, the current philosophy is to remove any impediments in the water course (the piers) which could negatively affect various fish species, so the new bridge will span the water channel without any in-water piers. That adds considerable cost to the project, but it is usually deemed acceptable. So the way I see it, the county has several options: 1) demo the existing bridge immediately, forcing long-term traffic detours, and rebuild in the same right-of-way footprint; 2) do temporary repairs to get the structure back open to traffic, shortening the detour times, which completing permitting and design, and then take it out of service for demo and replacement; 3) do permanent repairs and keep the structure in place - this would be the most cost-effective, but the least environmentally correct. And good bridge demolition contractor could have the entire structure down and removed in about 3 weeks (after getting the various permit approvals, etc.).
In total awh and amazement. Thanks for sharing
No sense in dredging the river silt now. That whole valley is sand based on the way it eroded. That sand cliff looks ominous.. usually sand is a filter for swimming pools so not much of a contribution to the dirty water. Looks like some up stream soil conservation efforts are needed. Then maybe a warning sign for canoes and kayaks about the up coming rapids. With those steep banks the portage may be short but difficult 😂
Like hello who made the decisions to not clear debris from the dam??
Looks like the dam is in the same shape as when it was built just the one side blew out 😊
If there was any commentary, it would have been nice to have the closed captions allowed (they’re currently blocked).
There was not any commentary.
Dam looks great. Now the “tie in” to the existing abutments or ground conditions needed a lot more attention was it a simple case of the rip rap was not deep enough or damaged …Were the surrounding soil samples not taken or ignored. Was this a case where sheet piles where recommended but not used due to cost. Did someone from a utility company or road construction bore a hole that caused a underground channel to form…To me the actual dam is still standing and appears to be in excellent shape…the dam was there for about 115 years till it was damaged about 10-11 years ago….Why did the State not properly (assuming the state controls waterways) inspected the dam or at the least have the Army’s Corp of Engineers do an investigation…if this was investigated was that report not acted on or was it a “drive by” investigation…”yup dam looked perfect fine as I drove passed it”….was the under mining of the bridge supports caused by the “extra” river flow due to the dam abutment failures or was it an existing condition could of identify a possible underground water channeling forming…Too Many opinions and not enough answer as far as I am concerned….As a person that had worked/lived around dams most of my life I feel someone missed a telltale sign that there was an issue with this dam…
There's a lot to talk about, and I'm sure a lot of info will come out in time. For what it's worth, there was a lot of careful inspection and work done over the years. I have read some of the documentation of all that, but I still don't think I know enough to really talk about it.
wake up babe new rapidan dam footage just dropped
After all this time I figured they'd have a more substantial road block than some snow fence and signs
What dam?
Wow
The destructive forces of water are VERY real. Never doubt it.
Grand Canyon if there was ever any doubt.
Water, in it's various forms, is the #1 creator of the landforms, worldwide. Or so I was taught in a college level geology course decades ago. I'm certain plate tectonics and volcanism play huge roles, as well.
@@loragunning5394 and ice can split a rock.
The dam looks just fine. The planet has failed.
You are so wrong my pucker just quivered.
Dam 1 Earth 0
@@jcoronet2000 Dam 0 Nature 1
Thanks for this video and the link to the Mankato Free Press article. I'd wondered where this would all go, and it seems both dam and bridge will be removed for a new bridge. It was interesting to watch the development on the Chilcotin River after a landslide blocked it causing a vast lake to grow. I had some idea what was going to happen when the lake water over topped the landslide because of watching the Rapidan Dam in Minnesota and the Manawa Dam in Wisconsin both get wrecked by rain/flood waters.
Thank God that it all turned out fine.
When the water thinks _well I'll just go around then._
This all happened because of the stupidly built dam that didnt account for debris.
I’d guess suspension bridges that don’t have supports in the high flood waterway will be the preferred option going forward.
A suspension bridge would be overkill. I measured the width of the river at the bridge on Google Earth. It's less than 400 ft wide. And it looks like the total span of the bridge is somewhere around 610 to 620 feet. Looking back at flood footage, the areas on either end of the bridge were above the flood waters so that length should be good going forwards. Nowadays, I don't think suspension bridges are even considered for anything under 3000 ft. Cable Stayed bridges are more economical below that length, but probably still overkill in the 600 to 700 ft range. The Tied-Arch or Bowstring bridge seems to fit the bill nicely. They can easily span this distance. The drawback is they can cost more per foot of length than other designs.
When I was a kid my dams usually failed the same way. I'm surprised the central span of that bridge hasn't given up against gravity yet.
It's still supported on pilings that were driven down to suitable earth, you can see the objects protruding down from the base in varying angles.
@@viktorakhmedov3442 I think Casey mentioned the pilings don't extend to bedrock. Don't those casings rely on surface friction? With half the casing length exposed to air we have to be getting close to a spectacular bridge failure. We just need a big rain storm to help push it over.
At this point, why not just let the river go back to its natural channel. Take the damn out and let nature do its thing. If they let the river continue where it is, it will eat away at that loose rock at the bend and eventually the river will find a new course.
The county or state (not sure who was supposed to be maintaining this) didn't do their job at all. It's amazing how many years go by with major infrastructure never being cleaned or looked at and the local officials all act surprised when there's a failure or catastrophic event. Makes me think of the bridge in Pittsburgh where they're ignored the visible damage and did nothing until it failed. Now they will beg for federal money to fix this. Unreal.
No. This dam was regularly inspected and updated. It was in need of major updates or removal after flood damage in 2019 but was not thought to be in any immediate danger. No decision had been made yet but was in process.
Bridge pier scour was caused by the debris caught on the upstream side not being removed thus causing turbulence.
Thanks for the video and showing the bridge supports up close!
Dam
Would love to know what going on with the folks that lost their home. How are they coping with this now.
2 sections on the end were never even opened
First they have to do a environmental impact study which will take three years then think about it then request federal funds. If state government would have done there job and kept the damb dam clear of debris they wouldn't have this problem. I hope the people that lost there business and home sue the state for not maintaining there dam
Rapidan Dam is owned and managed by Blue Earth County, after NSP turned over ownership of the dam and the land around it in 1972. They did that after it was damaged beyond economical repair by the 1965 flood, and because the original land contract (from around 1910) stated that ownership would revert to the county after hydroelectric power generation ceased. blueearthcountymn.gov/RapidanDam Also, regulatory authority has been with FERC. They were in the process of changing that to the state DNR, as the dam hadn't generated power since the last flood damages in 2019. Not sure where that process was when the failure occurred.
Should have kept the spillways clear . Was it not in the budget? Incompetence.
There was a long history of reductions in overall capacity. Budget was incredibly limited, and after flood damages in 2019, removal or repair were being worked on. blueearthcountymn.gov/RapidanDam
This is what happens when you don't keep a dam cleared of trees that block the water flow. Those trees (and even more) were there blocking the Dam before the flood !
That's false. There was a floating cable stretched under the bridge that caught many trees and it broke in the middle of the night, sending the debris into the dam. You can see it in some of the early video. At that point it was way too dangerous to put workers in heavy equipment on the riverbank or dam clear the blockage. The flooding is what put most of those trees there in the first place. A previous drought had resulted in more debris in the flood plain than usual.
They need to remove that dam at this point, shore up the bridge supports and leave well enough alone.
Really washed out / failed from the last video .
Interesting username...you sound nuts, I'd like to speak with you in person about your other beliefs.
I feel sorry for the people who's house got washed away.
And it just occurred to me that people are losing their property to the river. As in it used to be there and isn't today. What kind of insurance do you need other than Act Of God?