Leader Lake Dam Reservoir Report
Last Updated: January 12, 2026
Leader Lake Dam, located in Malott, Washington, is a privately-owned structure regulated by the Washington Department of Ecology.
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Summary
Built in 1910, this earth dam stands at a height of 61 feet and spans 350 feet in length, serving primarily for recreational purposes. With a storage capacity of 7681 acre-feet and a drainage area of 3.1 square miles, the dam poses a high hazard potential but has been assessed as satisfactory in condition.
The dam, situated on Tr-Tallant Creek, is known for its scenic beauty and recreational opportunities, drawing water resource and climate enthusiasts alike. Despite its age, Leader Lake Dam has undergone regular inspections, with the most recent assessment conducted in August 2021. The dam's emergency action plan status and risk management measures remain undisclosed, leaving room for further exploration and evaluation by interested parties.
As part of Congressional District 04 in Washington, Leader Lake Dam falls under the oversight of Representative Dan Newhouse (R) and the Seattle District of the US Army Corps of Engineers. The dam's location in Okanogan County adds to its appeal as a destination for outdoor enthusiasts seeking to explore the intersection of water resources and climate impacts in the Pacific Northwest. With its historical significance and ongoing regulatory oversight, Leader Lake Dam presents a compelling case study for those interested in the sustainable management of water infrastructure in a changing climate.
Year Completed |
1910 |
Dam Length |
350 |
River Or Stream |
Tr-Tallant Creek |
Primary Dam Type |
Earth |
Surface Area |
185 |
Hydraulic Height |
61 |
Drainage Area |
3.1 |
Nid Storage |
7681 |
Structural Height |
61 |
Hazard Potential |
High |
Foundations |
Rock, Soil |
Nid Height |
61 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Okanogan River At Malott
|
2050cfs |
Omak Creek Near Omak
|
7cfs |
Methow River At Twisp
|
1050cfs |
Twisp River Near Twisp
|
290cfs |
Okanogan River Near Tonasket
|
1910cfs |
Methow River At Winthrop
|
733cfs |
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.
Leader Lake- State Forest
Rock Creek- State Forest
Sportsmans Camp- State Forest
Okanogan County Fairground
American Legion City Park Campsite
Legion RV Park - Okanogan
Leader Lake Dam
Salmon Creek