Whitman Lake Reservoir Report
Nearby: Upper Silvis Granite Diversion
Last Updated: December 19, 2025
Whitman Lake, located in Ketchikan Gateway, Alaska, is a captivating destination for water resource and climate enthusiasts.
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Summary
This hydroelectric facility, completed in 1927, harnesses the power of Whitman Creek to generate electricity for the region. With a dam height of 39 feet and a length of 220 feet, Whitman Lake provides a storage capacity of 1440 acre-feet and covers a surface area of 148 acres.
The Federal Energy Regulatory Commission oversees the operation and inspection of Whitman Lake, ensuring its compliance with safety regulations. The dam's hazard potential is classified as high, emphasizing the need for regular inspections and emergency preparedness. While the condition assessment is currently not available, the dam's emergency action plan was last revised in June 2020, demonstrating a commitment to ensuring the safety and security of the surrounding community.
As one of Alaska's key hydroelectric facilities, Whitman Lake serves as a vital source of renewable energy and water resource management. Its scenic location and historical significance make it a must-visit destination for those interested in sustainable energy practices and the intersection of water resources and climate resilience.
Year Completed |
1927 |
Dam Length |
220 |
Dam Height |
39 |
River Or Stream |
Whitman Creek |
Surface Area |
148 |
Drainage Area |
4.1 |
Nid Storage |
1440 |
Structural Height |
39 |
Hazard Potential |
High |
Nid Height |
39 |
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.
Whitman Lake