USDA Forest Service

Forest Inventory and Analysis National Program


Forest Inventory & Analysis
National Office
U.S. Forest Service
1601 North Kent Street,
Suite 400
Arlington, VA 22209

(703) 605-4177

United States Department of Agriculture Forest Service.

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Click here for the latest user alerts.
April 11, 2014

  • FIA, in conjunction with the Forest Service Chief Information Office, will be implementing changes to the FIADB structure and data the third and fourth weeks of April. During that time, FIADB and the online tools will remain available; however, the data will consist of a mix of version 5.1 and 6.0 data. The most visible change is in the interpretation of the definition of reserved status. All annual data have been reanalyzed in accordance with this interpretation and some previously published values have been changed. Change estimates have been recomputed to account for any modifications. For more details please consult the FIADB User's Guide (

    For more information contact any of the following:

    Jim Menlove RMRS ( 801-625-5426

    Karen Waddell PNW ( 503-808-2046

    Chuck Barnett NRS ( 610-557-4031

    Carol Perry SRS ( 865-862-2087

  • We expect to correct this problem by late April 2014.
    Thank you for your patience. Please check here for further information and updates.

    March 11, 2014

  • We have discovered an issue in our calculation of sampling error estimates. Currently, sampling error estimates in EVALIDator are only valid when “trend analysis” is selected as the row variable. Population totals and ratio estimates from EVALIDator are valid and are not affected by this error.   Estimates from FIDO are not affected.

  • We expect to correct this problem by late April 2014.  

    Thank you for your patience. Please check here for further information and updates.

  • FIADB 5.1.6 - has been released. You may notice changes in FIADB tables, FIDO, EVALIDator and the DataMart. Some new tables may not contain data until the 2012 field data are processed.

  • Welcome to our site

    We are the Nation's Forest Census

    The Forest Inventory and Analysis (FIA) Program of the U.S. Forest Service provides the information needed to assess America's forests.

    As the Nation's continuous forest census, our program projects how forests are likely to appear 10 to 50 years from now. This enables us to evaluate whether current forest management practices are sustainable in the long run and to assess whether current policies will allow the next generation to enjoy America's forests as we do today.

    FIA reports on  status and trends in forest area and location; in the species, size, and health of trees; in total tree growth, mortality, and removals by harvest;  in wood production and utilization rates by various products; and in forest land ownership.

    The Forest Service has significantly enhanced the FIA program by changing from a periodic survey to an annual survey, by increasing our capacity to analyze and publish data, and by expanding the scope of our data collection to include soil, under story vegetation, tree crown conditions, coarse woody debris, and lichen community composition on a subsample of our plots.

    FIA is managed by the Research and Development organization within the USDA Forest Service in cooperation with State and Private Forestry and National Forest Systems. FIA traces it's origin back to the McSweeney - McNary Forest Research Act of 1928 (P.L. 70-466). This law initiated the first inventories starting in 1930.


    FIA Users Manual for Phase 2

    FIA Phase 2 User’s Manual



    Forest Inventory Data Online

    Surf forest inventory data using the FIDO on-line tool!! Create your own forest inventory tables and maps.




    USDA Forest Service
    Last Modified: April 17, 2014

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