Overby Pond Dam 1 Reservoir Report
Last Updated: December 21, 2025
Overby Pond Dam 1, located in Jalapa, Illinois, was completed in 1977 by the USDA NRCS and is privately owned.
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Summary
This earth dam stands at 31 feet high and has a length of 250 feet, with a primary purpose of serving as a fire protection, stock, or small fish pond. The dam has a storage capacity of 29 acre-feet and a maximum discharge of 144 cubic feet per second, with a low hazard potential and a moderate risk rating.
The dam is regulated by the Illinois Department of Natural Resources and undergoes state inspection, permitting, and enforcement. It is situated on the TR-Goose Creek W river/stream and falls under the jurisdiction of Macoupin County, Illinois. The spillway of Overby Pond Dam 1 is uncontrolled, with a width of 18 feet, and the outlet gates are also uncontrolled. The dam's condition assessment is currently not available, and it has not been assigned an Emergency Action Plan or inundation maps.
Despite its low hazard potential, Overby Pond Dam 1 poses a moderate risk and is in need of further risk assessment and management measures. As a vital water resource structure for fire protection and stock purposes, the dam's maintenance and safety are crucial for the surrounding community. Water resource and climate enthusiasts can appreciate the importance of managing and monitoring dams like Overby Pond Dam 1 to ensure their continued functionality and safety in the face of changing environmental conditions.
Year Completed |
1977 |
Dam Length |
250 |
Dam Height |
31 |
River Or Stream |
TR- GOOSE CREEK W |
Primary Dam Type |
Earth |
Surface Area |
2 |
Drainage Area |
0.02 |
Nid Storage |
29 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
31 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Macoupin Creek Near Kane
|
20cfs |
Spring Creek At Springfield
|
6cfs |
Illinois River At Valley City
|
4670cfs |
South Fork Sangamon River Nr Rochester
|
14cfs |
Indian Creek At Wanda
|
1cfs |
Bay Creek At Pittsfield
|
43cfs |
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.
Overby Pond Dam 1