Rio Grande County's GIS map is not a legal boundary survey

A parcel line on a screen looks authoritative, and in the San Luis Valley those online maps are genuinely useful for getting your bearings on a piece of ground. But GIS data is not intended to establish a legal boundary, convey or define property title, or make decisions in a real-estate transaction. That is a real limit, not boilerplate.

The drawn line is a representation, not a measured survey. It cannot tell you for certain where a fence should sit, whether a driveway clips the neighbor’s land, or exactly what acreage a deed conveys. Across the valley, where parcels run from old townsite lots to long agricultural tracts, small map offsets can translate into feet on the ground.

So treat the Assessor’s map and GIS tools as the place you begin, not the place you finish. When the boundary actually matters, the answers live in the recorded documents, the title work, and a surveyor’s stakes. A buyer leans on those before closing; an owner keeps the map handy for reference and lets the survey have the final word.

None of this makes the parcel tools less worth using. They point you toward the right questions and the right records faster than driving to the courthouse. Just remember what they are: a helpful sketch of the picture, not the legal description that defines it.