Property corner pins and monuments
Texas rules require monuments set deep and sturdy enough to keep a stable, distinctive location.
Corner monuments
Tennessee requires metal monuments to be at least half an inch in diameter.
A surveyor need not set a new monument where an existing one is undisturbed and adequate (Tennessee).
Indefinite corner markers such as trees, rock piles or fence corners may be referenced with additional monuments.
When a corner cannot be marked, Missouri surveyors set a witness monument on a survey line or its extension.
NOAA says never to disturb or move a benchmark, even if it appears damaged.
Sources: Monuments built to last; Typical pin sizes in Tennessee; Witness monuments; Geodetic marks are protected
Common questions
What is a property corner pin?
Texas rules require monuments set deep and sturdy enough to keep a stable, distinctive location.