CALTRANS TREE MORTALITY PROJECTS
A Caltrans tree mortality project to remove dead and dying hazardous trees follows nine (9) steps to ensure there is a consistent approach along state highways. The Statewide Tree Mortality Task Force (http://fire.ca.gov/treetaskforce/) provides aerial mapping and estimates of the number of dead trees per acre in High Hazard Zones. Tree mortality high hazard zones represent areas where tree mortality directly coincides with critical infrastructure, such as public roads. They represent clear threats. Caltrans contractors assess the health of every tree using a field crew under the direction of a Registered Professional Forester (RPF) and produce Tree Assessment Maps.
Methodology: High Hazard Zone Determination
Disclaimer: Caltrans Tree Mortality Projects are shown using Geographic Information System (GIS) mapping. Since all mapping has a margin of error, information shown is for tree assessment purposes only, and to aid in the sharing of the approximate location of dead and dying hazardous trees along the state highway. Maps are intended to assist the public and Caltrans staff in effecitvely communicating the process before, during and after hazardous trees are removed.
Tree Assessment Maps
Tree mortality is concentrated in High Hazard Zones. Tier 1 High Hazard Zones are areas where tree mortality directly coincides with critical infrastructure. They represent direct threats. Tier 2 High Hazard Zones are areas defined by watersheds (HUC 12, average 24,000 acres) that have significant tree mortality as well a ssignificant community and natural resource assets.
- Tree Mortality Task Force
The Tree Mortality Task Force is comprised of state and federal agencies, local governments, utilities, and various stakeholders that will coordinate emergency protective actions, and monitor ongoing conditions to address the vast tree mortality resulting from four years of unprecedented drought and the resulting bark beetle infestations across large regions of the State.
- Office of Governor Edmund G. Brown
- CA Department of Forestry and Fire Protection (CALFIRE)
- Governor's Office of Emergency Services (CAL OES)
Public Education & Workshops
- Upcoming workshops will be added soon.