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.

MightyMoe, post: 369331, member: 700 wrote: 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.

I believe that the KEY is in the Original (Resurvey) Notes, and exactly HOW the Correction Line was RUN, AND, how the Corners North & South thereof were established. The one that I have worked on most recently, was RUN WEST on a True Line, setting Corners every 40 chains. LATER in the same [Re]Survey, this line as CLOSED UPON by running North or South from established Corners of the Original Survey.

I suppose that could be construed more than one way though...

Loyal

Loyal, post: 369333, member: 228 wrote: I believe that the KEY is in the Original (Resurvey) Notes, and exactly HOW the Correction Line was RUN, AND, how the Corners North & South thereof were established. The one that I have worked on most recently, was RUN WEST on a True Line, setting Corners every 40 chains. LATER in the same [Re]Survey, this line as CLOSED UPON by running North or South from established Corners of the Original Survey.

I suppose that could be construed more than one way though...

Loyal

Generally I have seen them in independent resurveys, they are run through the township, sometimes all six miles. I had one maybe twenty years ago that was missing a section corner stone, and we discussed which way to prorate it in. That one was for an original survey that was completing a township. It runs 5 miles through the south line of the north tier of sections.

Talked to the BLM and came to a conclusion just in case, ended up accepting a fence corner anyway, so the point was moot, and now I don't remember which way was decided, but I THINK it was single prorate.

MightyMoe, post: 369337, member: 700 wrote: Generally I have seen them in independent resurveys, they are run through the township, sometimes all six miles. I had one maybe twenty years ago that was missing a section corner stone, and we discussed which way to prorate it in. That one was for an original survey that was completing a township. It runs 5 miles through the south line of the north tier of sections.

Talked to the BLM and came to a conclusion just in case, ended up accepting a fence corner anyway, so the point was moot, and now I don't remember which way was decided, but I THINK it was single prorate.

I agree... as a "general rule," a single proportion is correct.

I most often see Sectional Correction Lines on "Completion Surveys," so that's a little different than an Independent Resurvey.

In any case...IT DEPENDS :whistle:

I had to use the manual to remember what a sectional correction line is. :pinch:

Looks like the answer is single proportion. A correction line only placed during the original survey? so is is considered a township line? And falls under 7-16 as a "township boundary"?

Interesting topic. I need to do some more reading.

Beau_Immel, post: 369356, member: 8320 wrote: I had to use the manual to remember what a sectional correction line is. :pinch:

Looks like the answer is single proportion. A correction line only placed during the original survey? so is is considered a township line? And falls under 7-16 as a "township boundary"?

Interesting topic. I need to do some more reading.

MOST sectional correction lines I see were set during a resurvey, the Independent type. I know of at least one that was done as for a completion survey, so it's an original. Which also brings up the line along the completion survey and the "first" original survey, how do you prorate in a stair step section corner along that line? double proration or a broken boundary?