Schmidgall Dam 1 Reservoir Report
Nearby: Cilca Lake Dam Buffalo Drive Dam
Last Updated: December 20, 2025
Schmidgall Dam 1, located in Petersburg, Illinois, was completed in 1977 by the USDA NRCS and serves as a vital resource for fish and wildlife preservation in the area.
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Summary
This private dam, standing at 30 feet tall and spanning 350 feet in length, has a primary purpose of providing a fish and wildlife pond for the community. With a normal storage capacity of 35 acre-feet and a maximum discharge of 155 cubic feet per second, the dam plays a crucial role in maintaining the ecological balance of the TR- Sangamon River.
Managed by the Illinois Department of Natural Resources, Schmidgall Dam 1 has a low hazard potential and is inspected regularly to ensure its structural integrity. The uncontrolled spillway with a width of 20 feet helps regulate water flow during periods of high precipitation, while the dam's stone core and soil foundation provide stability. Despite its moderate risk assessment, the dam has not undergone any modifications in recent years and its condition assessment is currently not available. Overall, Schmidgall Dam 1 stands as a testament to the importance of water resource management and environmental conservation in Illinois.
Year Completed |
1977 |
Dam Length |
350 |
Dam Height |
30 |
River Or Stream |
TR- SANGAMON RIVER |
Primary Dam Type |
Earth |
Surface Area |
4 |
Drainage Area |
0.06 |
Nid Storage |
53 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
30 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Spring Creek At Springfield
|
7cfs |
Sangamon River At Riverton
|
125cfs |
South Fork Sangamon River Nr Rochester
|
11cfs |
Sangamon River At Petersburg
|
209cfs |
Lake Fork Near Cornland
|
17cfs |
Salt Creek Near Greenview
|
204cfs |
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.
Schmidgall Dam 1