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Re: Major bridge outage reported on Facebook
#Conditions
开云体育Lange :Packraft ?? I love that very stretch of the river south of MTR and also MTR :( that is unfortunately out I suppose, not to mention Evo and Muir ( of course I could venture up and back from Bishop and then continue south … because I did managed to book Bishop pass today ! So officially Mobo as you called it :)? Henning: Right on spot regarding PCT people getting there in a month! Karina Bezkrovnaia On Apr 23, 2023, at 00:29, Lange Jorstad via groups.io <langejorstad@...> wrote:
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Re: Speculating on the SFSJ bridge
This bridge of similar construction over Dusy branch shows a minor twist on the upstream side, since quite some years. Possibly caused by logs?
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Gesendet:?Sonntag, 23. April 2023 um 14:26 Uhr
Von:?"Mike Sherman" <msherman55@...> An:[email protected] Betreff:?Re: [JMT-groups.io] Speculating on the SFSJ bridge Most plausible failure mechanism to me is an extremely heavy, wet snow load that got lopsided as the upstream side melted, twisting the bridge until it buckled. Might have been aided by a strong wind coming downstream.
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But I'd love to hear what the pros say when they get in there!
Mike Sherman
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Re: Speculating on the SFSJ bridge
Most plausible failure mechanism to me is an extremely heavy, wet snow load that got lopsided as the upstream side melted, twisting the bridge until it buckled. Might have been aided by a strong wind coming downstream.
But I'd love to hear what the pros say when they get in there!
Mike Sherman
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Re: Major bridge outage reported on Facebook
#Conditions
The first nobo PCT hikers will be there next month, probably. Earlier than any ranger.
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Henning
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Gesendet:?Sonntag, 23. April 2023 um 04:43 Uhr
Von:?"Lange Jorstad via groups.io" <langejorstad@...> An:[email protected] Betreff:?Re: [JMT-groups.io] Major bridge outage reported on Facebook #Conditions I hope there will be some accommodation by the rangers for hikers routing around the bridge. Bad decisions often stem from hikers weighing up a short, risky choice (like crossing a damaged bridge, crossing a high flowing creek/river, or bushwhacking around cliffs on the opposite bank) versus a long backtrack or detour. I think PCT hikers in particular, who arrive at that point with 850 miles of hiking completed, will be very tempted to attempt the shortest workaround.
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Re: Major bridge outage reported on Facebook
#Conditions
开云体育Might be a good year for MOBO’s - do half the trail and come out before the bridge, then get a second permit to do the other part of the trail from a different trailhead (acknowledging that “second permits” may be in low supply if everyone is doing some variation of this, but might need to think laterally regarding trailheads and itineraries).?Or learn how to packraft and float on by the damaged bridge! On 22 Apr 2023, at 11:53 am, Ed Thoits <ecthoits@...> wrote:
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Re: Safely crossing the creek at the SFSJ bridge, what about this method?
Also, I wonder about this idea in the time frame after mid-July. Not before such.? On Sat, Apr 22, 2023 at 7:58 PM Roleigh Martin <roleigh@...> wrote: Also it is often the case water levels in the high sierra are lowest in the early morning too. Twice I crossed in the early morning.? --
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See my Google Profile for interesting research links:
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Re: Major bridge outage reported on Facebook
#Conditions
开云体育I hope there will be some accommodation by the rangers for hikers routing around the bridge. Bad decisions often stem from hikers weighing up a short, risky choice (like crossing a damaged bridge, crossing a high flowing creek/river, or bushwhacking around cliffs on the opposite bank) versus a long backtrack or detour. I think PCT hikers in particular, who arrive at that point with 850 miles of hiking completed, will be very tempted to attempt the shortest workaround.Seems like this could put a dent in the MTR resupply business this year - if people are forced to hike out and back in they might just take the opportunity to resupply in town. Not sure if that really matters to MTR, not their core business. On 23 Apr 2023, at 4:41 am, Karina Bezkrovnaia via groups.io <kbezkrovnaia@...> wrote:
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Safely crossing the creek at the SFSJ bridge, what about this method?
I have done the JMT 11 times in the last 20 years.? The years 2011 and 2017 involved a lot of hiking on snow and high creek crossings.? I have crossed creeks that were up to my waist in water. I also have taken 7 days of hiking safely on snow?courses from Ned Tibbits.? I came prepared on those two years to cross creeks in the following manner. First, I brought along 500 pound deep sea super ultralight fishing line (made of the same fabric as bullet-proof vests/Ursack bear bags):? I don't have access to weigh the string now, but it was only a matter of a couple (to few) of ounces to have several hundred feet of it. I figured if I came to a creek where the water was above the waist line, that one, we'd regroup as a group.? And should the water be too deep to cross over with your pack, that the best swimmer in the group would cross the creek with nothing but the deep sea fishing line (but have one person on the creek side behind you holding part of the line).? Once crossed over to the other side, secure the line to a 100% secure anchoring point (either a steel beam or tree or large boulder, and provided the line was slanted downhill from the starting side, one should be able to slide one's pack down the line to the other side of the creek. Granted, I never had to go to this extent in the 11 times I did the JMT, I always wondered if this scheme could not get the job done safely. I'd be curious?to hear from others what they think about this approach. One has to know their knots 100% well.? I always liked the bowline although I heard the double bowline was even better.? Use this search to learn more: One thing about this string, it works great as replacement tent guyline and as replacement boot string.? It is phenomenally strong, light, and ties well compared to nylon filament fishing line. Roleigh ? _ |
Re: Speculating on the SFSJ bridge
开云体育I would guess dynamic forces (like an avalanche) would be the culprit - seems like a bridge like this would be designed to manage a winter snow load, even a big one.I’ll be curious to see how close the bridge is to the water when the river rises, especially when logs get washed down the river. If that sag mid-span is severe enough, a log jam could damage it further, or just finish the job altogether. On 23 Apr 2023, at 12:02 pm, Mike Sherman <msherman55@...> wrote:
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Re: Speculating on the SFSJ bridge
开云体育An older and longer bridge on the MFSJ failed back in 1997, they managed to get it back into service the next year before proper repairs could be made. While I don't know if the failure this year bridge is in good enough condition for
temporary repairs it is at least an interesting read. Click on the photos for... more photos
From: [email protected] <[email protected]> on behalf of Mike Sherman <msherman55@...>
Sent: Saturday, April 22, 2023 6:53:35 PM To: [email protected] <[email protected]> Subject: Re: [JMT-groups.io] Speculating on the SFSJ bridge ?
I'm reading the photo as:
-right (downstream) handrail buckled and kinked outwards severely, twisting the bridge
-left handrail rotated about 45 degrees in the middle, with perhaps a kink in the middle of the deck (seen in the shadow in the river)
-seems still anchored on both abutments.
I agree that it still seems quite above the river. I doubt it is safe to cross. Restoring steel that has been severely kinked like this seems like quite a challenge, especially in the backcountry.
I'm quite curious how such a seemingly robust bridge could fail like this; it seemed to be in good shape when I crossed it last summer. Does anybody have any ideas on if/when/where an official report might
be published? If this could fail, what about the other bridges that have similar designs?
Luckily, failed steel bridges often retain clues that allow reconstruction of the collapse. Such was the case in 2007 when the I35 bridge here in Minneapolis dropped into the Mississippi river.
Mike Sherman
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Re: Speculating on the SFSJ bridge
I'm reading the photo as:
-right (downstream) handrail buckled and kinked outwards severely, twisting the bridge
-left handrail rotated about 45 degrees in the middle, with perhaps a kink in the middle of the deck (seen in the shadow in the river)
-seems still anchored on both abutments.
I agree that it still seems quite above the river. I doubt it is safe to cross. Restoring steel that has been severely kinked like this seems like quite a challenge, especially in the backcountry.
I'm quite curious how such a seemingly robust bridge could fail like this; it seemed to be in good shape when I crossed it last summer. Does anybody have any ideas on if/when/where an official report might be published? If this could fail, what about the other bridges that have similar designs?
Luckily, failed steel bridges often retain clues that allow reconstruction of the collapse. Such was the case in 2007 when the I35 bridge here in Minneapolis dropped into the Mississippi river.
Mike Sherman
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Re: Speculating on the SFSJ bridge
开云体育Chris,Some people know how to look at pics ! I didn’t notice the shadow :) you are right that it doesn’t look sitting in the river ? Karina Bezkrovnaia On Apr 22, 2023, at 18:18, Chris Armstrong <sacarmstrong@...> wrote:
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Speculating on the SFSJ bridge
Ok, admitedlly pure speculation on may part but I've zoomed in on the picture of the SFSJ River bridge and to me, it looks like the bridge is still suspended well above the river. From the overhead shot it looks to be sitting in the river itself but look at the shadow of the bridge and it appears that is not the case. Anyone else come to the same conclusion? Did just the downstream sided railing fail? Certainly it's gonna take folks getting in there to know for sure, and perhaps its in a precarious condition regardless, but perhaps a ray of hope?
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Re: Major bridge outage reported on Facebook
#Conditions
Regarding the Reddy's Hole option... I've seen that route marked as well, but haven't had a chance to explore it. That said, there are no junctions at either end that indicate the start/end of the trail, so I'm guessing it is in even worse condition than the "low route" I took. In 2018 I climbed up Fleming Mountain, visited Rae Lake, and walked up to Mosquito Pass and I didn't find any obvious spurs. But I did camp in Long Meadow with a hiker who has explored this area for decades and he talked about how wonderful the area around Reddy's Hole and Red Rock Basin is - and indicated that "old" trails went through the area. If the terrain is snow covered, I'd stay high, because it is shorter and nicer snow-walking out of trees, but if dropping down got me to dry trail, I'd probably take that this year. |
Re: Major bridge outage reported on Facebook
#Conditions
I think this is the last picture of Wayne Peferdehirt on Mather before his fall. The stretch of remaining snow that he slipped on was apparently very short -? a few yards
1 -- John Curran Ladd San Francisco, CA? 415-648-9279 |
Re: Major bridge outage reported on Facebook
#Conditions
>?I recall someone dying August 24th I think on Mather in 2019
> on a very last patch of snow … I was there earlier and Mather
> certainly is not as uncharted as any of the suggested cols.
I think this was just bad luck and maybe missing attention in the early morning around 7am.
https://kb.wisconsin.edu/images/group171/95769/717-MemorialResolutionforWaynePferdehirt.pdf
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Was there 2 weeks earlier, too, with just some remains of snow to traverse at a maybe 30-40° slope, with good boot tracks.
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While I met there two hiker w/o trekking poles:
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Henning
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PS: there will be a lot of PCT nobos in the coming months who will find a way. I bet, if the bridge is not too heavily damaged, they simply will cross there.
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Gesendet:?Samstag, 22. April 2023 um 20:40 Uhr
Von:?"Karina Bezkrovnaia via groups.io" <kbezkrovnaia@...> An:[email protected] Betreff:?Re: [JMT-groups.io] Major bridge outage reported on Facebook #Conditions Ravi,
Whether continued entrance interrupted by the road will be allowed remain to be seen.
That if not it will send hundreds of people into uncharted terrains - for sure. Worse even - this is the year when all that is the most dangerous situation one could think of. People saving weigh without traction devises, or not knowing how to use it… when there wouldn’t be “ boot tracks” as one must make his own path and no “ FarOut” guidance over “ normally ?existing” trail is. Many state that they launch on JMT as their first serious long range backpacking and going over snowy talus can be deadly if you don’t know how and even if you do.
I remember undergoing very rigorous interview with Sierra club leaders when signing for guided trip over Palisades high alpine terrain and farther into Muir Pass area.
Some have no idea what those “ detours” mean in terms of mileage combined with suncups, ice sheets, postholing and getting stuck between snow and large boulders when sun creates sort of tunnels around them and EG with huge pack.
I recall someone dying August 24th I think on Mather in 2019 on a very last patch of snow … I was there earlier and Mather certainly is not as uncharted as any of the suggested cols.
Lizzy’s and Ned’s info is extraordinary, but those people are Gods of backcountry. With lifelong navigational knowledge.
I should ask our dear John Ladd to state a % of people who are basically first timers on that terrain based on his survey.
Bishop pass permits are booked solid into September with 60% released.
We shall see a war over other 40% remaining I imagine.
I hope we won’t see voluminous SOS calls and SAR reports. But…
My far more than 2 cents ??
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Karina Bezkrovnaia
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Re: Major bridge outage reported on Facebook
#Conditions
开云体育Ravi,Whether continued entrance interrupted by the road will be allowed remain to be seen. That if not it will send hundreds of people into uncharted terrains - for sure. Worse even - this is the year when all that is the most dangerous situation one could think of. People saving weigh without traction devises, or not knowing how to use it… when there wouldn’t be “ boot tracks” as one must make his own path and no “ FarOut” guidance over “ normally ?existing” trail is. Many state that they launch on JMT as their first serious long range backpacking and going over snowy talus can be deadly if you don’t know how and even if you do. I remember undergoing very rigorous interview with Sierra club leaders when signing for guided trip over Palisades high alpine terrain and farther into Muir Pass area. Some have no idea what those “ detours” mean in terms of mileage combined with suncups, ice sheets, postholing and getting stuck between snow and large boulders when sun creates sort of tunnels around them and EG with huge pack. I recall someone dying August 24th I think on Mather in 2019 on a very last patch of snow … I was there earlier and Mather certainly is not as uncharted as any of the suggested cols. Lizzy’s and Ned’s info is extraordinary, but those people are Gods of backcountry. With lifelong navigational knowledge. I should ask our dear John Ladd to state a % of people who are basically first timers on that terrain based on his survey. Bishop pass permits are booked solid into September with 60% released. We shall see a war over other 40% remaining I imagine. I hope we won’t see voluminous SOS calls and SAR reports. But… My far more than 2 cents ?? Karina Bezkrovnaia On Apr 22, 2023, at 10:38, Marion Davison <mardav@...> wrote:
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Re: Major bridge outage reported on Facebook
#Conditions
I have done the Tyee hike and it's quite doable and scenic, as described in my earlier email.? Good solution for those who want to avoid a lotta road walking, hitching or arranging a shuttle.?? On Apr 22, 2023 10:23 AM, ravi_jmt2013 <ravi@...> wrote:
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