District of Columbia Boring Logs & Geotechnical Data
457 public boring logs in District of Columbia; 59 with digitized SPT, soil or CPT data; 398 scanned log PDFs. Sources include District DOT (DDOT), plus public reports found by web crawl. Free to search on the map, download or query by API.
Where the data comes from
Web-crawled reports in District of Columbia were published on, among others: doee.dc.gov, dgs.dc.gov, ncpc.gov, dmped.dc.gov, onlinepubs.trb.org, afrh.gov.
Counties with the most boring logs
| County | Boring logs | |
|---|---|---|
| District of Columbia | 457 | view on map |
What's in a boring log from District of Columbia
The 59 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 398 logs are scanned PDF reports — the original agency drawings — which you can open and download from the map. Holes are typically about 37 ft (11 m) deep; one in twenty goes past 60 ft (18 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 District of Columbia 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 15 September 2026.
Other places
Florida (169,272)Washington (151,490)North Carolina (99,626)Ohio (78,298)Oregon (61,084)New Jersey (49,413) all regions →