Authoritative map context
PLSS geometry and optional historic federal survey context are displayed from BLM Colorado cadastral services, with official GLO research links.
Research Guides STATEWIDE SURVEY CONTROL RESEARCH
Colorado PLSS monument records & NGS survey control
Start with any of Colorado's 64 counties or open the statewide map to research PLSS townships, sections, corner points, DORA monument records, optional historic BLM survey context, and NOAA NGS control.
64Colorado counties indexed5NGS control classes availableBLM · GLO · DORA · NOAAAuthoritative research sources
TOPO COLORADO PLSS PRO
Explore the statewide map free. Upgrade when the research gets serious.
Pan, search, toggle layers, and inspect survey points without an account. Create a free account only when you are ready to use direct records, KML downloads, or field navigation.
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COUNTY DIRECTORY
Choose a Colorado county
Each county page opens a complete county overview with PLSS records and optional statewide NGS control layers.
Statewide NGS survey control
Toggle NOAA NGS horizontal, vertical, combined, CORS, and other passive marks with links to official datasheets.
Professional research index
Use the viewer to locate evidence, then verify the official document and controlling survey evidence.
Data use & source rights
Topo Colorado provides a compiled research index and does not relicense or rehost official records. Source data and usage rights remain governed by the publishing agencies: BLM cadastral services, BLM GLO Records, Colorado DORA, and NOAA NGS.