Thesepages include tabular summaries of geospatial overlays performed in theanalysis of roadless area conservation alternatives. Geographic Information Systems (GIS) were used to perform theseanalyses. In some cases the analyseswere performed by overlaying national-scale, coarse resolution spatial datasetswith inventoried roadless areas (IRAs). In these cases the GIS overlay provides summaries by region and stateonly. The following definitions willhelp interpret the summary tables.
| Definitions of Inventoried Roadless Areas Categories | |
1B | Inventoried roadless area where road construction or reconstruction is not allowed. |
| 1B-1 | Inventoried roadless area where road construction or reconstruction is not allowed, and the forest plan recommends as wilderness. |
| 1C | Inventoried roadless area where road construction or reconstruction is allowed. |
| Definitions of Fire Condition Classes | |
| 1 | Forested areas with an historically short fire return interval usually have frequent fires of low intensity. |
| 2 | One or more fire return intervals have been missed, possibly resulting in increased fire sizes and intensities and decreased landscape mosaics and diversity. |
| 3 | Multiple fire return intervals have been missed resulting in dramatic departure from historical conditions. |
| Definitions of Fire Regimes | |
| 1 | 0-35+ years/low severity |
| 2 | 0-35+ years/stand-replacement |
| 3 | 35-100+ years/mixed severity |
| 4 | 35-100+years/stand replacement |
| 5 | 200+ years stand replacement |
| The Fire Regimes are described in terms of frequency and severity and represent pre-settlement, historical fire processes. Fire regimes I and II represent frequent fire return intervals. The 0-35+ years/low severity fire regime (I) occurs mostly on forested land. The 0-35+years/stand-replacement regime (II) occurs mostly on grasslands and shrublands. Fire regimes III, IV, and V have longer fire return intervals and occur on forest lands, shrublands, and grasslands. | |
| Definitions of Protected Area Database GAP Codes | |
| 1 | National Park, National Monument, Wilderness Area, Nature Reserve/Preserve, Research Natural Area |
| 2 | State Parks, State Recreation Areas, National Wildlife Refuge, National Recreation Area, Area of Critical Environmental Concern, Wilderness Study Area, Conservation Easement, Private Conservation Land, National Seashore |
| 3 | BLM Holdings, Military Reservations, National Forests, State Forest, Wildlife Management Areas, Game and Fish Preserves, Fish Hatcheries, State Commemorative Area, Access Area, National Grassland, ACOE Holding |
| 4 | Private Land, Tribal Land, City Park, Undesignated State Land, County Land, City Land |
Mortality |
| Risk of mortality from insects and diseases is defined as the expectation that 25 percent or more of the trees will die in the next 15 years. |
| Interior Columbia Basin Ecosystem Management Project |
| Hydrologic Unit Code |