In the central Appalachian Mountains of West Virginia, where historic and current levels of sulfur and nitrogen atmospheric deposition are among the highest in the eastern U.S., acidic deposition is degrading headwater streams and may predispose forests to secondary stresses such as nutrient imbalance, susceptibility to winter damage, and vulnerability to diseases and insect infestations. On the Monongahela National Forest, historical data sets from the United States Forest Service Forest Inventory and Analysis program were used to map forest productivity across sites of varying sensitivity to acid deposition. A hypothesized Site Sensitivity Index based on soil parent material, depth, mineralogy, texture, rock content, and site slope, aspect, and elevation was created using soil data from the Soil Survey Geographic Database and site data from USGS Digital Elevation Models. We hypothesize that forests are at risk on sites classified as highly sensitive. Chemical analysis of soil and foliage from a 30-site subsample support this hypothesis. This work will be used to develop a monitoring program for forest managers of sites affected by acid deposition.