Justison Pond Dam 1 Reservoir Report
Last Updated: December 6, 2025
Justison Pond Dam 1, located in Hillsboro, Illinois, was completed in 1970 and is primarily used for fish and wildlife pond purposes.
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Summary
The dam, standing at a height of 30 feet and a length of 200 feet, has a storage capacity of 25 acre-feet and covers a surface area of 2 acres. It is regulated by the Illinois Department of Natural Resources and undergoes regular inspections to ensure its structural integrity.
The dam, designed by the USDA NRCS, is classified as an earth dam with a stone core and soil foundation. It has an uncontrolled spillway with a width of 20 feet and a maximum discharge capacity of 147 cubic feet per second. Despite being rated as having a low hazard potential, the dam is considered to have a moderate risk level (3) due to its location and potential impact on downstream areas.
While the dam has not been modified in recent years and its condition assessment is not available, it is important to continue monitoring and maintaining it to prevent any potential risks or hazards. Justison Pond Dam 1 plays a significant role in supporting the local ecosystem and providing recreational opportunities, making it a valuable asset for both water resource and climate enthusiasts to explore and appreciate.
Year Completed |
1970 |
Dam Length |
200 |
Dam Height |
30 |
River Or Stream |
TR- SHOAL CREEK W MID FORK |
Primary Dam Type |
Earth |
Surface Area |
2 |
Drainage Area |
0.03 |
Nid Storage |
25 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
30 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
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.
Justison Pond Dam 1