Are there any database for the soils database out there beside NRCS ? I am fully aware that NRCS has their database on their website but I was wondering if there is one that can't i find them ? I am looking more specific for Colorado. They can be either database or geospatial but I prefer them to be the database that goes back to 1990's They need to have mapunit, map name, and their survey areas ?
The ISRIC (International Soil Reference and Information Centre) Soil Data Hub has world-wide soil data from multiple sources.
You can search by data extent. It returned 102 search results for a rectangle drawn around Colorado. Results include a variety of information types such as carbon content, silt content, "harmonized world soil database" and many more.
Datasets on this website are licensed under Creative Commons licenses CC BY-NC or CC BY.