Acreages within various characteristic layers stratified by Inventoried Roadless Area categories within Oregon.
All acreage figures are rounded to the nearest 1,000.
Oregon INVENTORIED ROADLESS AREA CATEGORIES SUM
  …that does not allow road construction and reconstruction   …that does not allow road construction and the Forest  Plan recommends wilderness   …that does allow road construction and reconstruction  
IRA Category acres (1,000)   797       1,168   1,965
       
FIRE CONDITION CLASS   acres* (1,000) %   acres* (1,000) %   acres* (1,000) %   acres* (1,000)
Condition Class 1     105 13     0   202 17   307
Condition Class 2     356 45     0   448 38   804
Condition Class 3     293 37     0   439 38   732
Non-Vegetation       0     0     0    
Agriculture     38 5     0   53 5   91
Urban/Development/Agriculture   4 1     0   25 2   29
Water         0     0     0    
 
FIRE REGIMES                      
0-35 yrs; Low Severity     218 27     0   563 48   781
0-35 yrs; Stand Replacement     19 2     0   49 4   68
35-100 yrs; Mixed Severity     425 53     0   347 30   772
35-100 yrs; Stand Replacement     0     0     0    
200 + yrs; Stand Replacement   135 17     0   208 18   343
Barren       0     0     0    
Water         0     0     0    
 
MORTALITY                      
Risk of Mortality Not Present     754 95     0   1,097 94   1,851
Risk of Mortality Present     43 5     0   71 6   114
 
LAND COVER CLASS                      
Deciduous Forest     9 1     0   4 0   13
Evergreen Forest     737 93     0   1,056 90   1,793
Mixed Forest       0     0     0    
Shrub-Brush Rangeland     6 1     0   4 0   10
Rangeland     4 1     0   26 2   30
Wetland       0     0     0    
Tundra       0     0     0    
Urban/Development/Agriculture   42 5     0   78 7   120
Barren Land       0     0     0    
Water         0     0     0    
 
PROTECTED AREA DATABASE                      
GAP Code 1   8 1     0   11 1   19
GAP Code 2   6 1     0   6 1   12
GAP Code 3     769 96     0   1,134 97   1,903
Outside of PAD     15 2     0   19 2   34
* These GIS overlays were prepared from coverages compiled at various scales and resolutions.  To account for the differences in scales and resolutions, a percent-area by attribute was calculated for each characteristic overlay layer.  The acres in each roadless category/characteristic attribute were calculated by multiplying percent-area and total acreages from the Inventoried Roadless Area coverage.  Derived acres have been rounded to the nearest 1,000 acres.