Alaska has 4 high hazard dams with a condition assessment of poor or unsatisfactory. These are dams where failure would probably cause loss of human life and where recognized safety deficiencies have been identified.
Of the 29 high hazard dams in Alaska, 4 (13%) have concerning condition ratings — 4 rated poor and 0 rated unsatisfactory.
Condition scale, best to worst
- Satisfactory No existing or potential safety deficiencies recognized; acceptable performance expected under all loading conditions.
- Fair No deficiencies under normal operating conditions; a rare flood or earthquake could create one.
- Poor A safety deficiency is recognized under normal operating conditions; remedial action is necessary.
- Unsatisfactory Worst rating. The dam is considered unsafe; a deficiency requires immediate or emergency remedial action.
"Not rated" means no assessment is on file in the National Inventory of Dams.
| Dam | County | Height (ft) | Condition | Last inspected | Purpose | Year |
|---|---|---|---|---|---|---|
| Wrangell Upper | City and Borough of Wrangell | 28 | Poor | 12/05/20187 yrs ago | Water Supply | 1967 |
| Wrangell Lower | City and Borough of Wrangell | 28 | Poor | 12/05/20187 yrs ago | Water Supply | 1968 |
| Alitak Cannery Dam #1 | Kodiak Island Borough | 9 | Poor | 06/20/20188 yrs ago | Water Supply | 1917 |
| Explorer Glacier Pond Dam | Municipality of Anchorage | 7 | Poor | 07/20/20197 yrs ago | Fish and Wildlife Pond | 1989 |