Mill Creek Structure 7 Dam Reservoir Report
Last Updated: December 22, 2025
Mill Creek Structure 7 Dam, also known as the Mill Creek Watershed Impoundment, is a privately owned dam located in Hutsonville, Illinois, along Hurricane Creek.
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Summary
Built in 1976 by the USDA NRCS, this earth dam stands at a height of 42 feet and spans 760 feet in length. Its primary purpose is flood risk reduction, with a storage capacity of 3,723 acre-feet and a drainage area of 8.6 square miles.
Managed by the Illinois Department of Natural Resources, the dam features an uncontrolled spillway with a width of 161 feet and is classified as having a low hazard potential. Despite its moderate risk assessment rating, the dam's condition assessment is currently marked as not available, with the last inspection conducted in August 2019. While there are no associated structures or locks, the dam's maximum discharge capacity is 4,870 cubic feet per second, providing essential flood protection for the surrounding area.
For water resource and climate enthusiasts, Mill Creek Structure 7 Dam serves as a critical infrastructure in mitigating flood risks along Hurricane Creek in Clark County, Illinois. With its strategic location and design, the dam plays a key role in managing water flow and protecting the local community from potential flooding events. As efforts continue to monitor and assess the dam's condition, its role in safeguarding against floods underscores the importance of sustainable water resource management in the region.
Year Completed |
1976 |
Dam Length |
760 |
Dam Height |
42 |
River Or Stream |
HURRICANE CREEK |
Primary Dam Type |
Earth |
Surface Area |
55 |
Drainage Area |
8.6 |
Nid Storage |
3723 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
42 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Wabash River At Terre Haute
|
2380cfs |
Wabash River At Riverton Ind
|
2610cfs |
North Fork Embarras River Near Oblong
|
53cfs |
Embarras River At Ste. Marie
|
65cfs |
Busseron Creek Near Carlisle
|
138cfs |
Big Raccoon Creek At Coxville
|
100cfs |
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.
Mill Creek Structure 7 Dam