Washington Boring Logs & Geotechnical Data
199,045 public boring logs in Washington; 52,477 with digitized SPT, soil or CPT data; 146,568 scanned log PDFs. Sources include Washington Geological Survey, City of Seattle (EDMS), Washington State DOT (WSDOT), plus public reports found by web crawl. Free to search on the map, download or query by API.
Where the data comes from
- Washington Geological Survey106,774
- City of Seattle (EDMS)41,125
- Public reports collected by web crawl34,090
- Washington State DOT (WSDOT)17,030
- USGS CPT program15
- Wisconsin DOT (WisDOT)9
- Chicago DOT (CDOT)1
- City of Portland (BDS)1
Web-crawled reports in Washington were published on, among others: apps.ecology.wa.gov, permitbulletin.mercerisland.gov, activeprojects.issaquahwa.gov, bellevuewa.gov, static.spokanecity.org, cityoflacey.org.
Counties with the most boring logs
| County | Boring logs | |
|---|---|---|
| King | 151,846 | view on map |
| Snohomish | 13,475 | view on map |
| Kitsap | 5,403 | view on map |
| Pierce | 4,040 | view on map |
| Spokane | 3,991 | view on map |
| Clark | 3,304 | view on map |
| Thurston | 2,699 | view on map |
| Cowlitz | 2,687 | view on map |
| Grays Harbor | 1,575 | view on map |
| Whatcom | 1,195 | view on map |
| Skagit | 1,173 | view on map |
| Lewis | 955 | view on map |
What's in a boring log from Washington
The 52,477 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 146,568 logs are scanned PDF reports — the original agency drawings — which you can open and download from the map. Holes are typically about 21 ft (6 m) deep; one in twenty goes past 82 ft (25 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 Washington 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 13 October 2026.
Other places
Florida (172,401)North Carolina (102,530)Ohio (80,932)Oregon (73,397)California (58,907)New Jersey (51,412) all regions →