Colorado Boring Logs & Geotechnical Data
7,152 public boring logs in Colorado; 6,774 with digitized SPT, soil or CPT data; 378 scanned log PDFs. Sources include City and County of Denver, University of Nebraska–Lincoln, plus public reports found by web crawl. Free to search on the map, download or query by API.
Where the data comes from
- City and County of Denver4,493
- Public reports collected by web crawl2,501
- University of Nebraska–Lincoln158
Web-crawled reports in Colorado were published on, among others: solicitations.thorntonco.gov, summitcountyco.gov, arkansasriverconservancy.colorado.gov, hermes.cde.state.co.us, vendorportal.ecms.va.gov, csu.org.
Counties with the most boring logs
| County | Boring logs | |
|---|---|---|
| Denver | 4,480 | view on map |
| El Paso | 789 | view on map |
| Adams | 250 | view on map |
| Arapahoe | 195 | view on map |
| Weld | 183 | view on map |
| Douglas | 160 | view on map |
| Larimer | 135 | view on map |
| Summit | 105 | view on map |
| Jefferson | 103 | view on map |
| Dolores | 99 | view on map |
| Bent | 79 | view on map |
| Yuma | 61 | view on map |
What's in a boring log from Colorado
The 6,774 digitized borings carry the data engineers actually use: SPT blow counts (N-values) by depth, soil and rock descriptions, groundwater observations and, where the source ran cone penetration tests, CPT tip resistance and sleeve friction. A further 378 logs are scanned PDF reports — the original agency drawings — which you can open and download from the map. Holes are typically about 14 ft (4 m) deep; one in twenty goes past 56 ft (17 m). Not sure what a boring log looks like? See annotated example boring logs.
How to get this data
- Map — pan to a site, click a boring, and view the log, the original PDF, or an ML soil-profile prediction. No account needed.
- Downloads — every boring exports as PDF, DIGGS XML or AGS4; draw a polygon on the map for a multi-boring export or a site report.
- API — query borings by coordinates or bounding box, pull SPT/CPT/lab records, and generate site reports programmatically.
- Contribute — have Colorado boring logs that are not here yet? We take PDFs, DIGGS, AGS and spreadsheets.
This data was collected from public agencies and is republished as-is. It is a planning tool, not a substitute for a site investigation; see the terms and disclaimer. Counts refreshed 2 November 2026.
Other places
Washington (186,877)Florida (171,716)Ohio (80,944)California (75,283)Oregon (71,862)North Carolina (70,533) all regions →