Inventoried Roadless Area acreages in Special Designated Areas by Category of Area and Management Prescription within Mega-region
All acreage figures are rounded to the nearest 1,000.  The Eastern Mega-region does not include a 2,100 acre Research Natural Area ploygon in Puerto Rico where road construction is prohibited.
			IRA Categories
		Special Designated Area outside of IRAs in the US	Inventoried Roadless Areas where road construction is Prohibited	Inventoried Roadless Areas recommended for wilderness	Inventoried Roadless Areas where road construction is allowed	Inventoried Roadless Areas	Total Special Designated Areas in US
		acres (1,000)	acres (1,000)	acres (1,000)	acres (1,000)	acres (1,000)	acres (1,000)
ALASKA	National Primitive Area
	National Scenic Research Area
	National Scenic Area
	National Wild & Scenic Rivers
	National Recreation Area		7			7	7
	National Game Refuge/Wildlife Preserve
	National Monument	3,107					3,107
	National Volcanic Monument
	National Historic Area
	Wilderness Study Area		380	1,590		1,970	1,970
	Research Natural Area		38			38	38
	Other Congressionally Designated Areas		854			854	854
	Sum	3,107	1,279	1,590		2,869	5,976
EASTERN US	National Primitive Area
	National Scenic Research Area
	National Scenic Area	7	8			8	15
	National Wild & Scenic Rivers	192	4	2	6	12	204
	National Recreation Area	421	49		34	83	504
	National Game Refuge/Wildlife Preserve
	National Monument
	National Volcanic Monument
	National Historic Area
	Wilderness Study Area	3	3	33		36	39
	Research Natural Area	33	7		1	8	41
	Other Congressionally Designated Areas	7					7
	Sum	664	70	35	41	146	810
WESTERN US	National Primitive Area	181					181
	National Scenic Research Area	8	1		2	3	11
	National Scenic Area	115	43	7		50	165
	National Wild & Scenic Rivers	670	93		86	180	850
	National Recreation Area	1,453	180	212	726	1,118	2,572
	National Game Refuge/Wildlife Preserve	640			56	56	696
	National Monument	219	108			108	326
	National Volcanic Monument	145	25		2	27	172
	National Historic Area
	Wilderness Study Area	392	393	215	197	805	1,197
	Research Natural Area	235	141	28	58	227	462
	Other Congressionally Designated Areas	720	452	16	50	518	1,238
	Sum	4,778	1,435	478	1,178	3,091	7,869
ENTIRE US	National Primitive Area	181					181
	National Scenic Research Area	8	1		2	3	11
	National Scenic Area	122	51	7		58	180
	National Wild & Scenic Rivers	863	97	2	92	191	1,054
	National Recreation Area	1,874	236	212	760	1,208	3,083
	National Game Refuge/Wildlife Preserve	640			56	56	696
	National Monument	3,326	108			108	3,434
	National Volcanic Monument	145	25		2	27	172
	National Historic Area
	Wilderness Study Area	396	776	1,838	197	2,811	3,206
	Research Natural Area	268	186	28	59	272	541
	Other Congressionally Designated Areas	727	1,305	16	50	1,372	2,099
	Sum	8,550	2,784	2,103	1,219	6,106	14,656