Carlanna Lake
Carlanna Lake is a buttress dam located in Ketchikan Gateway Borough, Alaska, built in 1975. It carries a High hazard potential classification and has a satisfactory condition assessment.
About Carlanna Lake
The primary purpose of Carlanna Lake is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by City Of Ketchikan (local government). It impounds the Carlanna Creek near Ketchikan.
The dam stands 31 feet tall and stretches 340 feet across, creates a reservoir covering 32 acres, has a maximum storage capacity of 700 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1975, the structure is well into its service life at over 50 years old.
This dam carries a high hazard potential classification, which means that a failure or uncontrolled release of water would likely cause loss of human life. This classification reflects the consequences of failure, not the likelihood — it indicates that people live or work in the area downstream. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. An emergency action plan is in place for this dam. The most recent inspection on record was 10/05/2020.
Living Downstream
If you live or work downstream of this dam, consider taking these steps: learn your local evacuation routes, check whether your county emergency management office has a dam failure inundation map, and sign up for local emergency alerts. The Alaska dam safety program can provide more specific information about emergency planning for this structure.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Alaska |
| County | Ketchikan Gateway Borough |
| Nearest City | Ketchikan |
| River/Stream | Carlanna Creek |
| Coordinates | 55.36897, -131.68980 |
Physical Characteristics
| Dam Type | Buttress |
| NID Height | 31 ft |
| Dam Height | 31 ft |
| Dam Length | 340 ft |
| Year Completed | 1975 (51 years old) |
Storage & Hydraulics
| NID Storage | 700 acre-ft |
| Max Storage | 700 acre-ft |
| Normal Storage | 390 acre-ft |
| Surface Area | 32 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 4,700 cfs |
Ownership & Safety
| Purpose | Water Supply |
| Owner | CITY OF KETCHIKAN |
| Owner Type | Local Government |
| Hazard Classification | High |
| Condition Assessment | Satisfactory |
| Last Inspection | 10/05/2020 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | AK00011 |
| Federal ID | AK00011 |
| More Info | State Dam Safety Program |