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Foist
Sultan of Sweat



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PostFri Jan 22, 2021 8:59 am 
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I've never been to La Bohn Gap but I've considered going there, and I was always confused by how the map didn't seem to match up to the Harvey Manning 100 Hikes description.  Now I know why!
The new TF layer on Caltopo is also really interesting.  Does anyone know how it's compiled and how it differs from the Mapbuilder layer?
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Gil
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PostSun Jan 24, 2021 11:47 am 
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timberghost wrote:
That's better because you have to go below La Bohn Gap. Then would have to drop down to Chain Lakes, Williams, etc.

I suppose that would be true if you went the wrong way (far right) before reaching the top of the pass and La Bohn Lakes.


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Randito
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PostSun Jan 24, 2021 1:35 pm 
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FWIW:  When my son and I climbed Mt Hinman in 2003, we camped at Williams Lake, hiked up though Chain Lakes to the pass between Chain Lakes and La Bohn Lake and then headed east up Hinman.    Fred Becky in the Cascade Alpine Guide refers to this pass as "La Bohn Gap"   

La Bohn Lake lies NE of this gap and La Bohn Peak lies SW.   

In older USGS maps of the area the "L" of "La Bohn Gap" is shown on the saddle between Chain Lakes and La Bohn Lake and the center of the text "La Bohn Gap" lies on the saddle between Chain Lakes and Lake Rowena.

The terrain between that saddle and Lake Rowena is very steep and not particularly useful as a travel route and there aren't any mines in the Lake Rowena basin that the miners would have been travelling to and from.    There are numerous mines in the Chain Lakes area.  There is old mining equipment and mines in the Necklace Valley.

So which is easier to believe:  1) That miners labeled a pass they didn't use very much and off to the side of their usual travel route with the same name as closer by features.  2) A USGS clerk in the 1960s who had never visited the area made a mistake placing a label on a newer higher resoution map.
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Sky Hiker
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PostSun Jan 24, 2021 4:49 pm 
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https://www.topozone.com/washington/king-wa/gap/la-bohn-gap/

Nice try I like this as a real gap
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Randito
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PostSun Jan 24, 2021 5:07 pm 
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You may inspect the historical USGS maps of the area yourself

https://ngmdb.usgs.gov/topoview/viewer/#14/47.5605/-121.2373

Here is an inset of the 1902 map where the "L" of "La Bohn Gap" lies on the saddle between Chain Lakes and La Bohn Lakes -- notice too the shapes of Williams lake and Lake Rowena are significantly different from modern maps.  Also note that the "I" in "Iron Cap Mtn" is on the summit.  That name isn't centered on the summit.

Historical Topographic Map Collection
Historical Topographic Map Collection
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Randito
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PostSun Jan 24, 2021 5:19 pm 
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Since 2017 the updated USGS topo maps show La Bohn Gap as the pass between Chain Lakes and La Bohn Lakes -- you can inspect using the link above or just look at this inset

US Topographic Map Collection
US Topographic Map Collection
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timberghost
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PostSun Jan 24, 2021 6:30 pm 
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Sky Hiker wrote:
https://www.topozone.com/washington/king-wa/gap/la-bohn-gap/

Nice try I like this as a real gap

2nd this local
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BigBrunyon
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PostSun Jan 24, 2021 7:11 pm 
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The real situation is that there are two different la bohn gaps

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Carbonj
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PostSun Jan 24, 2021 9:49 pm 
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I believe what our father in heaven, Fred Becky wrote.
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timberghost
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PostMon Jan 25, 2021 5:35 am 
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Carbonj wrote:
Okay I  looked at the map, La bohn gap goes to the east to rowena lake, I accessed mt hinman on a ski trip that way. I'm right dammit.

Of coarse you are
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Carbonj
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PostTue Jan 26, 2021 7:30 am 
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timberghost wrote:
Of coarse you are

Hey I skied icy slopes all that day, fending off red bull induced  teens, sucked down a KBS stout. I'm old and ornery and I will  try and keep from cussin in the future.  vent.gif
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FiveNines
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PostTue Jan 26, 2021 12:51 pm 
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timberghost wrote:
Of coarse you are

Such course language.
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timberghost
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PostWed Jan 27, 2021 5:53 am 
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Of Coarse it was
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