Our objective was to develop a consistent nationwide assessment of risk of impaired watershed condition for the nearly 4000 5th-level (10-digit) watersheds containing National Forest System (NFS) land in the contiguous 48 states. This assessment is broad-scale and relies on nationwide data sets. It is intended to inform decisions on where to focus future, more in-depth watershed assessment, which would in turn help in determining where watershed protection actions would be most effective. The assessment ranks 5th-level watershed condition by national forest, National Forest System Region, and water resource region.
The workbook Risk of Watershed Impairment Workbook (see description) lists the basic data on stressors and at-risk resources, computes the values of risk of impaired watershed condition of the watersheds, and summarizes those values. In RWI.xls (available here; 56 MB .xlsm, revised December 8th, 2010), users can easily change the weights and compute new scale values and corresponding risk levels, rankings, and quantiles, as well as tables and graphs summarizing the results.
The workbook RWI compare.xlsm (available here; 20 MB .xlsm) compares levels of indicators and levels of risk on NFS lands with corresponding levels on non-NFS lands. Briefly, the combine sheet reproduces the relevant information from RWI.xlsm for the two sets of land areas and the Compare sheet compares by watershed the levels of indicators and of risk for all watersheds with both NFS and non-NFS land.
This document contains tables with detailed results of the assessment of risk of impaired watershed condition by National Forest System (NFS) unit for watersheds with NFS land in the conterminous U.S.
This document contains two tables showing the incidence of threatened & endangered species by NFS unit.
These 21 figures depict the values for each of the 3672 watersheds for the indicators.
These four figures depict whole watershed risk level for the 3672 watersheds for selected summary scale values based on the full set of indicators.
These nine figures present risk levels for non-wilderness NFS parts of watersheds, for all three problems together.
These eight figures present graphs of scale values for the non-wilderness NFS parts of the NFS units of each region showing the contribution of the three problems towards the summary scale value for the unit.