Nashville City Reservoir Dam Reservoir Report
Last Updated: December 25, 2025
Nashville City Reservoir Dam, located in Pinkneyville, Illinois, is a vital structure providing both recreational opportunities and water supply to the area.
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Summary
Built in 1935 by CALDWELL ENGINEERING CO., this earth dam stands at a height of 26 feet and spans a length of 740 feet, with a storage capacity of 701 acre-feet. The dam's primary purpose is for recreation, but it also serves as a source of water supply for the surrounding community.
Managed by the Illinois Department of Natural Resources, the dam's state-regulated status ensures regular inspections and enforcement of safety measures. Despite its high hazard potential, the risk assessment for Nashville City Reservoir Dam is moderate. The spillway, with a width of 180 feet, is uncontrolled, and the dam's condition assessment is currently unavailable. With a drainage area of 1.4 square miles and a maximum discharge of 9710 cubic feet per second, the dam plays a crucial role in managing water resources in the region.
As a key feature in the St. Louis District, Nashville City Reservoir Dam contributes to the environmental and recreational landscape of Washington County, Illinois. Its historical significance, combined with its important functions in water supply and recreation, make it a valuable asset for both residents and visitors to enjoy and appreciate.
Year Completed |
1935 |
Dam Length |
740 |
Dam Height |
26 |
River Or Stream |
TRIB NASHVILLE CREEK |
Primary Dam Type |
Earth |
Surface Area |
52 |
Drainage Area |
1.4 |
Nid Storage |
701 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
High |
Foundations |
Unlisted/Unknown |
Nid Height |
26 |
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.
Nashville City Reservoir Dam