Acreages within various characteristic layers stratified by Inventoried Roadless Area categories within all states
INTERPRETATION GUIDE
All acreage figures are rounded to the nearest 1,000.
National Summary			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)				19,970			4,212			34,336			58,518
FIRE CONDITION CLASS				acres* (1,000)	%		acres* (1,000)	%		acres* (1,000)	%		acres* (1,000)
Condition Class 1				4,580	40		1,271	50		12,795	43		18,646
Condition Class 2				3,784	33		779	30		9,845	33		14,408
Condition Class 3				2,642	23		424	17		5,187	17		8,253
Non-Vegetation					0			0		34	0		34
Agriculture				156	1		18	1		688	2		862
Urban/Development/Agriculture				290	3		64	3		1,080	4		1,434
Water				21	0			0		20	0		41
FIRE REGIMES
0-35 yrs; Low Severity				3,383	29		312	12		8,800	30		12,495
0-35 yrs; Stand Replacement				563	5		46	2		1,389	5		1,998
35-100 yrs; Mixed Severity				3,915	34		1,249	49		12,708	43		17,872
35-100 yrs; Stand Replacement				1,653	14		462	18		3,075	10		5,190
200 + yrs; Stand Replacement				1,951	17		492	19		3,631	12		6,074
Barren					0			0		34	0		34
Water				21	0			0		20	0		41
MORTALITY
Risk of Mortality Not Present				18,229	91		3,491	83		30,253	88		51,973
Risk of Mortality Present				1,728	9		714	17		4,074	12		6,516
LAND COVER CLASS
Deciduous Forest				727	6		70	3		2,567	9		3,364
Evergreen Forest				8,824	77		2,190	86		21,139	71		32,153
Mixed Forest				107	1		6	0		137	0		250
Shrub-Brush Rangeland				976	9		115	4		2,791	9		3,882
Rangeland				123	1		23	1		902	3		1,048
Wetland					0			0			0
Tundra				238	2		72	3		297	1		607
Urban/Development/Agriculture				451	4		85	3		1,772	6		2,308
Barren Land					0			0		34	0		34
Water				21	0			0		20	0		41
PROTECTED AREA DATABASE
GAP Code 1				443	2		33	1		244	1		720
GAP Code 2				419	2		835	20		671	2		1,925
GAP Code 3				17,764	89		3,163	75		32,034	93		52,961
Outside of PAD				1,331	7		165	4		1,371	4		2,867
* 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.
** Characteristic layer information was not available for Puerto Rico, therefore the 23,733 IRA acres on the Caribbean NF are not included in the national summary.  Fire Condition Class, Fire Regimes, or Land Cover Class information was not available for Alaska.  Therefore, the 14,820,498 IRA acres on the Chugach NF and Tongass NF are not included in the national summaries of those categories.