Acreages within various characteristic layers stratified by Inventoried Roadless Area categories within Montana.
All acreage figures are rounded to the nearest 1,000.
Montana 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)   1,729   824   3,844   6,397
       
FIRE CONDITION CLASS   acres* (1,000) %   acres* (1,000) %   acres* (1,000) %   acres* (1,000)
Condition Class 1     545 32   237 29   1,026 27   1,808
Condition Class 2     565 33   335 41   1,464 38   2,364
Condition Class 3     503 29   227 28   1,107 29   1,837
Non-Vegetation       0     0     0    
Agriculture     26 2   3 0   35 1   64
Urban/Development/Agriculture   88 5   21 3   208 5   317
Water         0     0   4 0   4
 
FIRE REGIMES                      
0-35 yrs; Low Severity     135 8   48 6   188 5   371
0-35 yrs; Stand Replacement     3 0   6 1   31 1   40
35-100 yrs; Mixed Severity     776 45   378 46   2,083 54   3,237
35-100 yrs; Stand Replacement   691 40   271 33   1,372 36   2,334
200 + yrs; Stand Replacement   121 7   121 15   165 4   407
Barren       0     0     0    
Water         0     0   4 0   4
 
MORTALITY                      
Risk of Mortality Not Present     1,158 67   475 58   2,521 66   4,154
Risk of Mortality Present     570 33   349 42   1,322 34   2,241
 
LAND COVER CLASS                      
Deciduous Forest     22 1   21 3   61 2   104
Evergreen Forest     1,547 90   765 93   3,459 90   5,771
Mixed Forest       0     0     0    
Shrub-Brush Rangeland       0   2 0   8 0   10
Rangeland     38 2   8 1   65 2   111
Wetland       0     0     0    
Tundra     5 0   2 0   8 0   15
Urban/Development/Agriculture   114 7   26 3   242 6   382
Barren Land       0     0     0    
Water         0     0   4 0   4
 
PROTECTED AREA DATABASE                      
GAP Code 1     26 2   18 2   15 0   59
GAP Code 2     92 5   622 75   31 1   745
GAP Code 3     1,521 88   181 22   3,736 97   5,438
Outside of PAD       90 5   3 0   61 2   154
* 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.