Introduction

• What Is Hazard?

Why Be Concerned?
Factors Influencing Tree Hazard

1. Potential for Tree Failure
   • Tree Defects
     1. Cracks
     2. Lean
     3. Root damage
     • Disease agents
     4. Top damage
     5. Internal decay
     • 1/3 Rule
     • Disease agents
     6. Scars
     7. Dead Branches
     8. Dead Trees
     9. Carpenter Ants
   • Other Factors
   • Site factors
   • Tree fall direction
   • Tree age/size
   • Species
   • Hazard Profiles of Alaska Trees
   • Common Disease Agents of Alaskan Trees
2. Potential for Striking a Target
3. Potential for Serious Damage
4. Value of Target

Hazard Tree Rating

• Which Trees Should be Evaluated?
• Hazard Rating System
• Recording an Evaluation
• Tools used in Hazard Tree Evaluation

Prevention and Maintenance

• Corrective Actions
• Placement of New Recreation Sites
• Minimizing Future Hazard
• Tree Failure Reporting
• Hazard Profiles of Alaskan Tree Species

Acknowledgments

• Web page References
• Hazard Tree Bibliography
• Hazard Tree Leaflet
• Hazard Tree Book

Links