Acreages within various characteristic layers stratified by Inventoried Roadless Area categories within California.
All acreage figures are rounded to the nearest 1,000.
California 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)   1,727   163   2,527   4,416
       
FIRE CONDITION CLASS   acres* (1,000) %   acres* (1,000) %   acres* (1,000) %   acres* (1,000)
Condition Class 1     765 44   81 50   1,385 55   2,231
Condition Class 2     330 19   59 36   508 20   897
Condition Class 3     589 34   23 14   536 21   1,148
Non-Vegetation       0     0     0    
Agriculture     17 1     0   48 2   65
Urban/Development/Agriculture   24 1     0   48 2   72
Water       2 0     0   5 0   7
 
FIRE REGIMES                      
0-35 yrs; Low Severity     706 41   69 43   753 30   1,528
0-35 yrs; Stand Replacement     123 7     0   308 12   431
35-100 yrs; Mixed Severity     426 25   34 21   814 32   1,274
35-100 yrs; Stand Replacement   297 17     0   430 17   727
200 + yrs; Stand Replacement   173 10   59 36   217 9   449
Barren       0     0     0    
Water       2 0     0   5 0   7
 
MORTALITY                      
Risk of Mortality Not Present     1,659 96   157 96   2,393 95   4,209
Risk of Mortality Present     67 4   6 4   134 5   207
 
LAND COVER CLASS                      
Deciduous Forest     157 9     0   169 7   326
Evergreen Forest     1,086 63   129 79   1,519 60   2,734
Mixed Forest       0     0     0    
Shrub-Brush Rangeland     394 23   13 8   708 28   1,115
Rangeland     5 0   1 0   15 1   21
Wetland       0     0     0    
Tundra     41 2   20 12   18 1   79
Urban/Development/Agriculture   43 3     0   93 4   136
Barren Land       0     0     0    
Water       2 0     0   5 0   7
 
PROTECTED AREA DATABASE                      
GAP Code 1     71 4   3 2   33 1   107
GAP Code 2     69 4     0   40 2   109
GAP Code 3     1,556 90   113 69   2,395 95   4,064
Outside of PAD       33 2   47 29   58 2   138
* 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 multiply percent-area and total acreages from the Inventoried Roadless Area coverage.  Derived acres have been rounded to the nearest 1,000 acres.