I actually know someone who knows a lot about this thread at least as it would apply in Arkansas and Oklahoma.
A lot of times in subdivisions they would put a spike in the ground on the road in front of the house where it would be paved over then they would come along later if they had to survey a house there and find that spike with a metal detector.
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http://www.tractorbynet.com/forums/showthread.php?t=91155&goto=newpost
Let me comment on some of the things I have seen in this thread.
1. Adverse posession- In arkansas it is 7 years. The problem is that most people do not read the adverse in Adverse Posession. The most common one i believe is fences. If someone puts a fence up on his property and lets say he moved it 5 feet on your land. If you do not have survey markers up and did not realize he put it on your land then after 7 years he does not aquire the property. On the other hand if you knew it was in the wrong place and sent them a letter telling them to move the fence then waited over 7 years to do anything about it then you might have a problem.
2. I believe the country was divided up into squares and most property is tied to those. If you had the desire to spend enough money you might be able to go back to a range marker or township marker etc and go from there. Most people dont want to spend that kind of money so things get a bit hazy sometimes. This of course does not even begin to think about covering property once owned by someone in an indian tribe. If you buy land once owned by someone that belonged to a recognized tribe it can get kind of dicy determining ownership.
3. Who cares about the lines. ? Well if it had been in Arkansas the people that Eddie wrote about early in the thread who had a house built over the line with part of it on someone elses property might have cared a lot about it. If you wanted to push the issue far enough you can make them either move the house or tear it down. But the landowner has the right to make them clear the house off of their land. It is rarely done they usually do what happened in that case. Swap some land for it. Sell it etc etc. But the law does recognize the right to make them move the structure.
4 I worked with a survey crew for a couple of weeks when I was broke and out of money. I dont know what kind of metal detector they use but it worked pretty good. A lot of times in subdivisions they would put a spike in the ground on the road in front of the house where it would be paved over then they would come along later if they had to survey a house there and find that spike with a metal detector.