Mt Adams really isn't that far east

General discussions on hiking in Oregon and the Pacific Northwest
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Chip Down
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Re: Mt Adams really isn't that far east

Post by Chip Down » October 25th, 2021, 4:48 pm

drm wrote:
October 25th, 2021, 7:12 am
But the center of the crater of MSH is not it's summit - that is on the southern rim, so that explains how the summit of MSH is a bit farther south. Something approximating the crater center (especially if there were a northern rim) looks like it would be as close to the same latitude of Adams as I can tell in that map.
Off-topic musing:

1. Perhaps someday the top of Crater Rock will be the summit of Hood. (I'm assuming the rim is eroding faster than the plug.)

2. Long ago, when the MSH dome was growing rapidly, it was believed that the top of the dome could soon* be the highest point of MSH.
* "soon" meaning one could have observed the destruction of the old summit, and live long enough to see a central summit rebuilt

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Water
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Re: Mt Adams really isn't that far east

Post by Water » October 26th, 2021, 3:33 pm

to that point the current summit of jefferson, my understanding is what used to be a vent (plug?) on the west side of the mountain and Jefferson was 1-2k foot higher and was since eroded down on the west side by glaciers over the millennia until the current state.
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Chip Down
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Re: Mt Adams really isn't that far east

Post by Chip Down » October 26th, 2021, 5:36 pm

Mountain climbing is a futile endeavor.

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wildcat
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Re: Mt Adams really isn't that far east

Post by wildcat » November 4th, 2021, 5:06 pm

My evidence for them being on an east-west line is from a camping trip on Adams on the September equinox some years ago at Crystal Lake. On the equinox the sun sets due west, and I watched it set into the crater of MSH.

But the center of the crater of MSH is not it's summit - that is on the southern rim, so that explains how the summit of MSH is a bit farther south. Something approximating the crater center (especially if there were a northern rim) looks like it would be as close to the same latitude of Adams as I can tell in that map.
Yeah, earlier I was measuring between marked points on the chart, which would make it appear that St. Helens is slightly SW of Adams. Using the scales and tracing west from the marker on Adams' eastern peak (12276') over the St. Helens crater (above the 8365' peak marker at St. Helens) then they do line up east-west, both on screen and on the paper chart. The east peak is at the center of Adams as it appears there.

Note there may also be a slight discrepancy because aero sectionals are a 1:500000-scale Lambert conformal conical projection and I'm measuring in a straight line with a wooden ruler, but it's negligible for the purposes of this discussion. For the national combined slippy chart on Skyvector, they reprocess it to a pseudo-Mercator projection so the sections all flow together seamlessly.... and even there the two mountains line up. https://skyvector.com/?ll=46.2397021307 ... 301&zoom=2


The entire eastern half of Mt. Adams (and all the way to U.S. 97 and beyond) is on Yakama Nation land.
Ah. I had been under the impression that the reservation was a bit further east. Thanks for the clarification.
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