Boundary Surveying and Retracement
Boundary Surveying and Retracement
This domain tests whether you can rank boundary evidence, retrace an original survey instead of inventing a new one, and document a defensible determination. Colorado items combine common-law boundary doctrine with the state minimum standards for boundary surveys.
Evidence hierarchy
- Natural monuments first - rivers, bluffs, ridges, calls that cannot be moved. Then artificial monuments: original GLO corners, bearing trees, set stones, and fences accepted as the boundary.
- Adjoinder and occupation evidence outrank courses and distances in many disputes; courses and distances outrank area; record bearings and coordinates are the weakest evidence.
- A called-for original monument controls even when the measured distance differs materially, once you have identified it as the monument called for.
Retracement classifications
- Existent - original monument found in place. Hold it; do not replace it.
- Obliterated - evidence of the original position survives: pits, mounds, bearing-tree remains, fragments of the stone. Rebuild at the recovered position.
- Lost - no reliable evidence of position. Restore by proportionate measurement between the nearest original controlling corners: single proportion along a line, double proportion for a section corner.
Worked example
Both original section corners at the ends of a mile line are found; the record distance is 5,280.00 ft. The quarter corner between them is gone - no stone, pits, or bearing trees. The line measures 5,302.40 ft between the found corners.
Because the corner is lost, you do not set it at 2,640.00 ft from either end. You proportion: 5,302.40 ÷ 2 = 2,651.20 ft. Set the quarter corner 2,651.20 ft from each controlling corner, on the line between them, and show the measured line, the proportion, and the basis of the restoration on the plat and in the surveyor report. If this were a section corner being restored between controlling corners in two directions, both latitude and departure would be proportioned - double proportion.
Traps
- Setting a lost corner at record bearing and distance - the most frequent scoring loss on retracement items.
- Proportioning from a corner set by a later surveyor rather than the original.
- Accepting a found pipe as the original corner without corroborating the documentary and physical record.
- Treating state plane coordinates as boundary evidence rather than as derived from the monuments themselves.