The Pacific Northwest Forest Inventory and Analysis (PNW-FIA) program measures and compiles data on plots in coastal Alaska, California, Hawaii, Oregon, Washington, and U.S.- affiliated Pacific Islands. Most data are available in Access databases and can be downloaded by clicking one of the links below. Each downloadable .zip file contains the database as well as reference info and documentation.
Current data summaries for each state can be found on our State Stats page.
PNW-FIA data are combined with data from all states in the U.S. and stored in the national FIADB. Data for any state can be accessed on the national FIA Data and Tools website. Raw data are available via the FIA Data Mart and table generator tools such as DATIM and EVALIDator provide a user-friendly interface for producing quick, customizable data summaries. The national FIADB User Guide provides comprehensive information on all fields in the database and is a good place to start when using the data.
Detailed field manuals for each inventory and year and available on the PNW-FIA Field Manuals page.
The PNW-FIA Program shifted from a periodic to an annual inventory system in 2001. Periodic inventories sampled primarily timberland plots outside of national forests and most reserved areas, in a single state within a 2- or 3-year window. Typically, re-assessments occurred every ten years in the West. For the annual inventory in the Pacific Northwest all forested plots are now sampled, with one-tenth of the plots in any given state being visited annually. A full annual inventory cycle is complete in ten years.