Author Topic: Mountain Extension - Official Work Thread  (Read 413407 times)

John Kokas

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Re: Mountain Extension - Official Work Thread
« Reply #435 on: January 14, 2018, 09:01:21 AM »
Thanks Jason for the detailed explanation of the bridge situation.  IMHO it will be best to maintain the higher elevation for the following reason.  As we have found in eastern PA, we are having more than average 100+ year floods.  Some is due to storms themselves but much is due to development and associated runoff.  Thus the Army Corps is reevaluating its criteria and expanding the floodplain mapping.  Planning over the long term, one cannot determine how much development may occur in the future and how it will effect stream flows.  In essence, better safe than sorry ................
Moxie Bootlegger

Mike Fox

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Re: Mountain Extension - Official Work Thread
« Reply #436 on: January 14, 2018, 09:35:19 AM »
This was no where near the 100 year high, but was more likely close to the annual high. I was glad to see this on person, because there are other factors in the immediate area that would cause the water to go even higher. The road bridge, for instance, was approximately 2 feet above the water. While on site, I figured our bridge would also have the same clearance.

Mike
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Jason M Lamontagne

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Re: Mountain Extension - Official Work Thread
« Reply #437 on: January 14, 2018, 09:52:00 AM »
Ok I see now that yesterday’s water made it above the high water line.  Mikes picture of the highway bridge made me look again.  Makes me wish I’d gone up yesterday afternoon.

Note the bottom of the bridge is roughly level w the current ground level (maybe 4” lower).  That indicates the clearance we’d have. 

See ya
Jason

Wayne Laepple

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Re: Mountain Extension - Official Work Thread
« Reply #438 on: January 14, 2018, 10:02:26 AM »
Another, perhaps unanticipated, benefit of raising the track and the bridge would be that the southbound approach, depending on the length of the runoff, would give southbound trains a bit of a boost to get a "run" toward the steep southbound grade.

Mike Fox

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Re: Mountain Extension - Official Work Thread
« Reply #439 on: January 14, 2018, 10:08:45 AM »
Looking at the National Weather Service, precipitation total for Wiscasset for this storm was 2.14 inches. This, added to the fact that the brook was covered with ice, led to ice jams and slow water flow.
Mike
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Jeff Schumaker

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Re: Mountain Extension - Official Work Thread
« Reply #440 on: January 14, 2018, 11:29:05 AM »
So, how long will tree clearing be delayed, due to the rain and warmer weather?

Jeff S.
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Fred Morse

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Re: Mountain Extension - Official Work Thread
« Reply #441 on: January 14, 2018, 01:38:04 PM »
I think they will be cutting Tues., let's hope! Weds. it's supposed to snow.

Jason M Lamontagne

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Re: Mountain Extension - Official Work Thread
« Reply #442 on: January 14, 2018, 01:49:07 PM »
Yes, cutting Tuesday!!  Please join us if you can!

Jason

Gordon Cook

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Re: Mountain Extension - Official Work Thread
« Reply #443 on: January 14, 2018, 02:30:49 PM »
Thanks for the complete and interesting explanation. The map helps a lot to understand the distances.

The pics are a stark example of the serious nature of this job and how that lazy and shallow brook we all have seen in the summer can change dramatically.
Gawdon

Mike Fox

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Re: Mountain Extension - Official Work Thread
« Reply #444 on: January 14, 2018, 02:49:40 PM »
Tree cutting on Tuesday will be going down the mountain. If I can make it, I want to burn the pile of brush at Trout Brook, which I will need no or minimal help for. I would like to wait for snow cover again before tree removal continues at the brook.
Mike
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Bill Reidy

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Re: Mountain Extension - Official Work Thread
« Reply #445 on: January 14, 2018, 04:14:34 PM »
Looking at the latest drawing for the bridge, I noticed the grade is flat across the bridge.  Does the climb up the mountain start just south of the bridge?  Or does it flatten out for the bridge?
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Joe Fox

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Re: Mountain Extension - Official Work Thread
« Reply #446 on: January 14, 2018, 06:05:02 PM »
The uphill climb starts off extremely easy, and is less than 1% for quite a ways. I suspect the only real 3% grade will be at the last 1,000' of the climb. From walks, and looking at Val maps, the grade slowly gets steeper and steeper the further south you go. As best as I can guess right now, there is about 1900' of 2% and steeper grade.

Mike Fox

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Re: Mountain Extension - Official Work Thread
« Reply #447 on: January 14, 2018, 06:40:08 PM »
I want to move the grade topic over here, as well as any questions that may come up for the rest of the work. So, I include one of the Topo maps here, to show the elevation at the bridge and the climb up the mountain.

Mike
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Mike Fox

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Re: Mountain Extension - Official Work Thread
« Reply #448 on: January 14, 2018, 06:42:21 PM »
Check the Mountain Thread for the grade discussion
Mike
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Carl G. Soderstrom

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Re: Mountain Extension - Official Work Thread
« Reply #449 on: January 14, 2018, 07:09:03 PM »
If my vote counts - keep it high.
The Hundred Year Floods seem to be coming every 10 to 12 years around here.

Though not exactly historically accurate - to alleviate fill and retaining walls - could the approaches
be on pile trestles? 2 to 3 foot high? Use concrete posts  to cut down maintenance, stained brown.