Johnson Pond Dam 1 Reservoir Report
Last Updated: December 6, 2025
Johnson Pond Dam 1, also known as Johnson Fee Area Pond, is a privately owned structure located in Hillsboro, Illinois.
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Summary
Built in 1966 by the USDA NRCS, this Earth-type dam serves the primary purpose of creating a Fish and Wildlife Pond. With a height of 30 feet and a length of 300 feet, the dam has a storage capacity of 75 acre-feet and covers a surface area of 4 acres. It is regulated and inspected by the Illinois Department of Natural Resources, ensuring its safety and compliance with state regulations.
Surrounded by the scenic TR- SHOAL CREEK E MID FORK river/stream, Johnson Pond Dam 1 provides vital habitat for fish and wildlife, as well as opportunities for recreational activities. Despite its low hazard potential, a moderate risk assessment rating highlights the importance of ongoing risk management measures. The dam features an uncontrolled spillway and outlet gates, with a maximum discharge capacity of 158 cubic feet per second. While the condition assessment is currently not available, regular inspections ensure the dam's continued safety and functionality.
Overall, Johnson Pond Dam 1 stands as a valuable resource for water and climate enthusiasts, contributing to the ecological diversity of Montgomery County, Illinois. Its construction and maintenance demonstrate a commitment to both conservation and public enjoyment, making it a noteworthy landmark within the St. Louis District. As efforts continue to mitigate potential risks and enhance the dam's resilience, this structure remains a vital component of the local landscape, blending ecological stewardship with recreational opportunities for the community.
Year Completed |
1966 |
Dam Length |
300 |
Dam Height |
30 |
River Or Stream |
TR- SHOAL CREEK E MID FORK |
Primary Dam Type |
Earth |
Surface Area |
4 |
Drainage Area |
0.08 |
Nid Storage |
75 |
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.
Johnson Pond Dam 1