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Terrestrial Condition Assessment (TCA) Insect and Pathogen Hazard (Map Service)

Published by U.S. Forest Service | Department of Agriculture | Catalog Last Checked: May 05, 2026 at 11:50 PM | Dataset Last Updated: August 25, 2022
The 2018 National Insect and Disease Risk Map (NIDRM) developed by USFS-FHAAST indicates locations where forests are stressed and susceptible to outbreaks of native and non-native insects and diseases. These include forests with overly high stand densities, and where soil/site conditions contribute to drought. The basis for assigning risk is the expectation that 25% or more of live basal area (three times the natural background rate of mortality) will die over the next 15 years due to insects and diseases.

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