Four Mile Creek Reservoir Report
Nearby: Port Edwards Centralia
Last Updated: December 15, 2025
Four Mile Creek, also known as Nepco Lake, is a privately owned dam located in Wood County, Wisconsin.
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Summary
This gravity dam was completed in 1926 and serves primarily for water supply purposes, with a storage capacity of 6,000 acre-feet. The dam stands at 33 feet high with a hydraulic height of 28 feet, offering recreational opportunities and hydroelectric power generation in addition to its main function of supplying water.
Managed by the Wisconsin Department of Natural Resources, Four Mile Creek has a low hazard potential and is deemed to be in satisfactory condition as of the last assessment in 2014. Despite its age, the dam has undergone modifications in 1928 and 1950, showcasing its resilience and adaptability to changing needs and regulations. With a drainage area of 29 square miles and a maximum discharge of 2,500 cubic feet per second, the dam plays a crucial role in water resource management and flood control in the region.
Located in the city of Port Edwards, Four Mile Creek's risk assessment is rated as very high, indicating the importance of effective risk management measures in place. With controlled spillways and regular inspections, the dam ensures the safety of the surrounding community while maintaining its operational efficiency. As water resource and climate enthusiasts, the intricate details of Four Mile Creek's design, functionality, and historical significance make it a fascinating subject of study and conservation efforts in Wisconsin's diverse landscape.
Years Modified |
1928 - Other, 1950 - Other |
Year Completed |
1926 |
Dam Length |
2084 |
Dam Height |
33 |
River Or Stream |
FOURMILE CREEK & BLOODY RUN |
Primary Dam Type |
Gravity |
Surface Area |
494 |
Hydraulic Height |
28 |
Drainage Area |
29 |
Nid Storage |
6000 |
Structural Height |
33 |
Hazard Potential |
Low |
Nid Height |
33 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Wisconsin River At Wisconsin Rapids
|
1610cfs |
Tenmile Creek Near Nekoosa
|
25cfs |
Yellow River At Babcock
|
44cfs |
Yellow River At Necedah
|
44cfs |
Tomorrow River Near Nelsonville
|
24cfs |
Big Eau Pleine River At Stratford
|
27cfs |
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.
Four Mile Creek
Nepco Lake -- Access Off County Hwy Z