Old Tom Creek Ws Str 29 Reservoir Report
Nearby: Young-Gibson Lake Dam Youngs Lake Dam
Last Updated: December 18, 2025
Old Tom Creek WS Str 29 is a crucial flood risk reduction structure located in Henderson, Illinois.
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Summary
Built in 1956 by USDA NRCS, this earth dam stands at a height of 22 feet and has a length of 391 feet, providing a maximum storage capacity of 107 acre-feet. Situated on the TR- OLD TOM CREEK N stream, this structure is regulated by the IDNR and inspected by the Natural Resources Conservation Service, with a significant hazard potential and a moderate risk assessment.
Despite its age, Old Tom Creek WS Str 29 remains a vital component of the area's flood risk management system, with a drainage area of 0.62 square miles and a maximum discharge capacity of 472 cubic feet per second. The dam's uncontrolled spillway and outlet gates are designed to handle potential flooding events, ensuring the safety of nearby communities such as Biggsville. With its primary purpose being flood risk reduction, this structure plays a crucial role in protecting the region from potential water-related disasters.
As a structure owned and maintained by the local government, Old Tom Creek WS Str 29 represents a collaborative effort between various agencies and organizations to safeguard water resources and mitigate the impacts of climate change in the region. Its continued operation and maintenance are essential for ensuring the safety and resilience of the community in the face of evolving environmental challenges.
Year Completed |
1956 |
Dam Length |
391 |
Dam Height |
22 |
River Or Stream |
TR- OLD TOM CREEK N |
Primary Dam Type |
Earth |
Drainage Area |
0.62 |
Nid Storage |
107 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
Significant |
Foundations |
Soil |
Nid Height |
22 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Henderson Creek Near Oquawka
|
45cfs |
Pope Creek Near Keithsburg
|
25cfs |
Edwards River Near New Boston
|
41cfs |
Skunk River At Augusta
|
406cfs |
Iowa River At Wapello
|
3600cfs |
Spoon River At London Mills
|
86cfs |
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.
Old Tom Creek Ws Str 29