Carlanna Lake Reservoir Report
Nearby: Ward Cove Cannery Dam Ketchikan Lakes
Last Updated: December 19, 2025
Carlanna Lake, located in Ketchikan Gateway, Alaska, is a captivating water resource managed by local government authorities.
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Summary
Built in 1975, the dam at Carlanna Lake stands at a height of 31 feet, serving primarily as a water supply source with a storage capacity of 700 acre-feet. The lake covers a surface area of 32 acres and drains an area of 1.5 square miles through Carlanna Creek, showcasing its vital role in the region's hydrological system.
This impressive structure, designed by R. W. Beck and Associates, has a satisfactory condition assessment and a high hazard potential, necessitating regular inspections every three years. Despite its high hazard potential, Carlanna Lake meets state regulatory standards for permitting, inspection, and enforcement, ensuring the safety and reliability of its operations. With a maximum discharge capacity of 4700 cubic feet per second, the dam plays a crucial role in flood control and water management in the area.
Surrounded by the picturesque landscapes of Alaska, Carlanna Lake stands as a testament to effective water resource management and infrastructure development. Its role in providing a stable water supply, regulating floods, and supporting the local ecosystem highlights the importance of sustainable water management practices in the face of climate change challenges. Enthusiasts and professionals in the water resource and climate sectors can draw inspiration from the careful design and maintenance of Carlanna Lake as a model for resilient water infrastructure in an ever-changing environment.
Year Completed |
1975 |
Dam Length |
340 |
Dam Height |
31 |
River Or Stream |
CARLANNA CREEK |
Primary Dam Type |
Buttress |
Surface Area |
32 |
Hydraulic Height |
29 |
Drainage Area |
1.5 |
Nid Storage |
700 |
Structural Height |
31 |
Hazard Potential |
High |
Foundations |
Unlisted/Unknown |
Nid Height |
31 |
Seasonal Comparison
Weather Forecast
Dam Data Reference
Condition Assessment
SatisfactoryNo existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.
Hazard Potential Classification
HighDams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.
Carlanna Lake