Project Overview

CBJ’s current hazard maps, adopted in 1987 for downtown Juneau, are based on maps created in the 1970s. These low-resolution maps combine landslide and avalanche areas into a single map which identifies moderate and severe hazard areas. The adopted 1987 maps are available here.

In 2018, the CBJ Community Development Department received a grant from the Federal Emergency Management Agency (FEMA) to update these maps with current scientific analysis, and to evaluate landslide and avalanche areas separately. Tetra Tech Inc. was hired as the contractor. Tetra Tech provided a first draft assessment in May 2021 with new maps.  In April 2022 Tetra Tech provided a final assessment with minor revisions to the primary document and maps, and supplemental memorandums. The contract with Tetra Tech has expired. The grant expires on September 30, 2022.

The final assessment includes updated maps, memorandums with background information on areas of special concern, and a memorandum that explains how to interpret the maps. The assessment is for informational purposes at this time.

Final Hazard Assessment

The project area map and final hazard assessment are available at the links below.

• Project Area Map
• *NEW* Final Hazard Assessment April 2022
  • 2022 Landslide Maps
  • 2022 Avalanche Maps
  • Appendix A Tetra Tech’s Limitations on Use of this Document
  • Appendix B Landslide Hazard Designation Mapping
  • Appendix C Technical Memos
    • Technical Memo 1: Landslide Mapping Accuracy and Modelling
    • Technical Memo 2: Landslide Designations and Boundaries – Bathe Creek and Highlands
    • Technical Memo 3: Mapping Overview Starr Hill Subdivision and Additional Information
    • Technical Memo 4:  Guide to Avalanche and Landslide Hazard Designations
    • Technical Memo 5: Landslide Hazard Designations at Telephone Hill and Gastineau Avenue
    • Technical Memo 6:  Severe Landslide Hazard Designations at Staff Hill and Gastineau Avenue
    • Technical Memo 7:  Considerations for Anthropogenic Terrain at Starr Hill and Gastineau Avenue
  • Appendix D Avalanche Modelling Parameters and Assumptions

Background Documents

• Assembly Committee of the Whole 2-14-2022 draft minutes
• Assembly Committee of the Whole 9-20-21 minutes
• Final 8-10-21 Planning Commission minutes
• Planning Commission Notice of Recommendation to the Assembly
• Community Development Department 8-10-21 presentation to the Planning Commission
• Contractor 8-10-21 presentation to the Planning Commission
• 8-10-21 Planning Commission hazard assessment staff report
• 7-21-21 Public Meeting
  • Community Development Department July 21 2021 presentation
  • Tetra Tech contractor July 21 2021 presentation
  • July 21 2021 public meeting Question and Answer session (Zoom recording)
  • July 21, 2021 public meeting Question and Answer session transcript
• Maps prepared by CDD that show the difference between the adopted 1987 hazard maps and the 2022 landslide and avalanche maps.
  • CDD adopted 1987 combined landslide-avalanche map
  • 2022 final avalanche map prepared by CDD
  • 2022 final landslide map prepared by CDD
  • 2022 map with difference between 1987 hazard maps and 2022 proposed maps, prepared by CDD
• Currently Adopted Landslide/Avalanche Maps
• Currently Adopted Landslide/Avalanche Regulations
  • Hillside Development
  • Landslide and Avalanche Areas
• Hazard Studies