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Western Oregon Forestland Productivity Classes
ORS 321.210
People who buy or sell large tracts of forestland in Oregon consider the productivity of the land to determine price. Higher productivity land is generally more valuable. Consequently, buyers and sellers generally appraise forestland based on the acres and value in each site class.

For the purpose of property taxation, the Department of Revenue (DOR) assigns value to forestland in western Oregon by classifying lands into eight productivity classes.
Within the forest industry, a common way of expressing site quality in western Oregon is using five classes of site ranking.
During the 1960s and 1970s, Revenue staff visited private forestland in western Oregon to classify each 40-acre block of land into a site class. The average site class was determined by using site measurements of trees, topographical features, vegetation types, and soil types. The five site classes are related to the eight DOR productivity classes as shown in the table below.
The FX class is used for non-productive (below site class V) forestland within a forested property. Examples of non-productive land valued as forestland include rock outcrops, swamps, ponds, utility easements, and some rock pits.
Eastern Oregon
Forestland in eastern Oregon is not assigned productivity classes. Consequently, there is no FX classification. However, at least 80% of the total area of a forestland application must meet minimum stocking requirements. 
Western Oregon Land
Productivity Class
Site Class
FAI+, I, I-
FXBelow site V