Stiles Reservoir Report
Nearby: Oconto Falls Lower Oconto Falls Upper
Last Updated: December 13, 2025
Stiles Dam, located on the Oconto River in Wisconsin, is a vital hydroelectric and recreational structure completed in 1949.
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Summary
Managed by the Federal Energy Regulatory Commission, this earth dam stands at a height of 29 feet and spans 2600 feet, with a storage capacity of 2400 acre-feet. The dam's controlled spillway, with a width of 60 feet, ensures effective water management during peak discharge events.
With a hazard potential rated as high and a risk assessment classifying it as very high, Stiles Dam poses significant challenges for risk management. Despite its condition assessment being unavailable, the dam remains a critical piece of infrastructure in the region. The emergency action plan was last revised in January 2021, indicating ongoing efforts to enhance the preparedness and response protocols for any potential emergencies related to the dam.
Stiles Dam serves as a testament to the intricate balance between harnessing water resources for power generation and ensuring the safety of surrounding communities. While its risk level is closely monitored, the dam continues to play a crucial role in supplying hydroelectric power and supporting recreational activities in the area. As water resource and climate enthusiasts, staying informed about the status and management of structures like Stiles Dam is essential for understanding the intersection of water infrastructure and environmental conservation.
Year Completed |
1949 |
Dam Length |
2600 |
Dam Height |
29 |
River Or Stream |
Oconto River |
Primary Dam Type |
Earth |
Surface Area |
463 |
Drainage Area |
796 |
Nid Storage |
2400 |
Outlet Gates |
Tainter (radial) - 3 |
Hazard Potential |
High |
Foundations |
Soil |
Nid Height |
29 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Oconto River Near Oconto
|
375cfs |
Oconto River Near Gillett
|
596cfs |
Peshtigo River At Peshtigo
|
488cfs |
Duck Creek Near Howard
|
27cfs |
Fox River At Oil Tank Depot At Green Bay
|
6470cfs |
Peshtigo River At Porterfield
|
532cfs |
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.
Stiles
Machickanee Flowage -- Access