Old Tom Creek Ws Str 25 Reservoir Report
Last Updated: December 18, 2025
Old Tom Creek WS Str 25, located in Biggsville, Illinois, is a key water resource management structure designed by the USDA NRCS in 1956 for flood risk reduction.
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Summary
This earth dam stands at a height of 25 feet and stretches 206 feet in length, providing a storage capacity of 50 acre-feet. With a low hazard potential and a moderate risk assessment rating, this structure plays a crucial role in mitigating flood risks in the area.
Operated and inspected by the Natural Resources Conservation Service, Old Tom Creek WS Str 25 is regulated by the Illinois Department of Natural Resources and undergoes regular inspections every 5 years. The dam features an uncontrolled spillway type with a width of 23 feet, ensuring proper water discharge during peak flow events. Despite its age, the condition assessment for this structure is not available, highlighting the need for ongoing monitoring and maintenance to ensure its continued effectiveness in flood risk reduction.
The Henderson County dam sits on the TR- HENDERSON S; TR- MISS rivers, serving as a vital component of the local water management system. With its strategic location and design, Old Tom Creek WS Str 25 stands as a testament to the importance of sustainable water resource infrastructure in the face of changing climate patterns and increasing flood risks.
Year Completed |
1956 |
Dam Length |
206 |
Dam Height |
25 |
River Or Stream |
TR- HENDERSON S; TR- MISS |
Primary Dam Type |
Earth |
Surface Area |
4 |
Drainage Area |
0.09 |
Nid Storage |
50 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
25 |
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 |
Spoon River At London Mills
|
86cfs |
Iowa River At Wapello
|
3600cfs |
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 25