Summary
Built in 1910 by H. M. Byllesby Engineering, this private-owned dam serves primarily for hydroelectric purposes, with additional benefits for fish and wildlife ponds and recreation. With a gravity design and a height of 21.5 feet, the dam spans 92 feet in length and has a storage capacity of 109 acre-feet, providing essential water resources for the surrounding area.
Managed by the Federal Energy Regulatory Commission, the Bigfork Diversion Dam has a spillway width of 235 feet and a high hazard potential due to its size and location. Despite its age, the dam has a moderate risk assessment and undergoes regular inspections to ensure its safety and functionality. While not regulated by the state, the dam plays a crucial role in the local ecosystem and economy, highlighting the intersection of water resource management and climate resilience in the region.
For water resource and climate enthusiasts, the Bigfork Diversion Dam stands as a historic yet vital infrastructure supporting the sustainable development of the Flathead area. Its rich history, engineering design, and multifaceted purposes make it a fascinating subject for those interested in the intersection of water management, renewable energy, and environmental conservation. As climate change continues to impact water resources, dams like Bigfork play a crucial role in adapting to these challenges and providing reliable water and energy resources for future generations.
Year Completed |
1910 |
Dam Length |
92 |
Dam Height |
21.5 |
River Or Stream |
Swan River |
Primary Dam Type |
Gravity |
Surface Area |
73 |
Hydraulic Height |
12 |
Drainage Area |
736 |
Nid Storage |
109 |
Structural Height |
22 |
Hazard Potential |
High |
Nid Height |
22 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
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.
Area Campgrounds
| Location | Reservations | Toilets |
|---|---|---|
Wayfarers State Park
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Wayfarers State Park Campground
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West Shore State Park
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Handkerchief Lake
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Graves Bay
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Bigfork Diversion Dam
Birch Lake
Big Hawk Lake
Blackfoot Lake