Lost section corner on sectional correction line

True/false, multiple choice or essay question?

Multiple choice.... but it boiled down to either double or single proportion. I chose single because I considered it to be a senior line, but like I said I'm unsure.

Jim_H, post: 368823, member: 11536 wrote: Multiple choice.... but it boiled down to either double or single proportion. I chose single because I considered it to be a senior line, but like I said I'm unsure.

That's a very good question, I've been lucky so far, when I've been running out those sectional lines they have been in place, but I've always wondered the same thing.

My guess, after reading 3-66 of the 2009 Manual.....

"This line is surveyed on a true latitudinal curve initiated at the first regular section corner on the east boundary and projected to an intersection with the west boundary of the township, where a section corner is established and the distances are measured and recorded to the nearest corners on the range line north and south. The intermediate quarter-section and section corners are established at regular intervals of 40 chains, alternately, counting from the east."

It sounds to me a sectional correction line is established in a similar manner as a township line is established, therefore single proportion would be appropriate in most instances.

Was 'at the intersection of 4 ancient fences in cardinal directions, identified by the 90 year old owner who grew up there' an option?
Sorry, I couldn't resist...B-)

It is not a true single proportion as you have to account for it being on a curve. The distance is single prorated but it is not set on line between the 2 corners that control the distance, it is set on an offset using something called a Rohm line I believe to keep it on the correct Latitude. I am sure I misspelled the Rohm name. Dennis Muland (ms) has a really good course on this.

In Washington State it might actually be on a curve. Anywhere East of the Rockies and it's probably whatever the cheapest contractor did while hundreds of miles from major areas of civilization. While consuming a keg of whiskey per day. While having running battles with those who had been occupying the area for centuries prior to the survey. While encountering terrain and weather conditions that were incredibly different from their boyhood homes in Vermont and Delaware. While hiring new help with no knowledge of anything related to surveying other than how to wield an ax. While living on subsistence rations because Government paychecks arrived even slower then than they do today. While viewing 90 percent of what they were creating as being unfit for human settlement.

Sectional correction lines were run inside a township, usually during an independent resurvey. But they were also run during a completion original survey.

That is actually quite a question for the LS test, really digging into the PLSS. It's a question we discussed in the office a few times and got the answer for once but I don't remember what it was.

Do you prorate between corners along the line or double prorate it. I've always seen the Sectional Correction Lines running east-west and the Sectional Guide Meridians running north-south.

My two bits...

Treat it the same as a Township or Standard Parallel "Line" (single proportion on the arc).

BUT don't reject ANYTHING along that "line" without a really good reason...

Loyal

thebionicman, post: 368877, member: 8136 wrote: Was 'at the intersection of 4 ancient fences in cardinal directions, identified by the 90 year old owner who grew up there' an option?
Sorry, I couldn't resist...B-)

You mean that fence corner that was shown on the plat done about 16 months after the original survey called it as the section corner? I'm certain that's not important! :whistle:

Whatever you do, document it, so when we reject it, we can justify it! (Tongue in cheek!)
🙂
One thing you know for sure, is when you SPM or DPM a corner, is it is NOT at the original location.

N

Bushwhacker, post: 368882, member: 10727 wrote: It is not a true single proportion as you have to account for it being on a curve. The distance is single prorated but it is not set on line between the 2 corners that control the distance, it is set on an offset using something called a Rohm line I believe to keep it on the correct Latitude. I am sure I misspelled the Rohm name. Dennis Muland (ms) has a really good course on this.

That would be a Rhumb Line, aka a Loxodrome. It's defined as a line that crosses all Meridian Lines at the same angle.

What were the answers besides singe or double proportion?

Seems to me like the question was not worded very well. You do not establish corners "on" a correction line? The correction line is run in a "random" direction hence the term correction line.

Beau_Immel, post: 369325, member: 8320 wrote: What were the answers besides singe or double proportion?

Seems to me like the question was not worded very well. You do not establish corners "on" a correction line? The correction line is run in a "random" direction hence the term correction line.

That would be poorly worded, I'd imagine that they were asking how do you reestablished a lost section corner on a sectional correction line.
My recollection is that you single prorate a true LOST corner. And of course it would be on the arc, simple enough to do these days if you are using GPS.
But I can't cite anything that says it's a single prorate.