Conway Farm Subdivision Lake Dam Reservoir Report
Last Updated: December 16, 2025
Conway Farm Subdivision Lake Dam, located in Mahomet, Illinois, was completed in 2004 by the design firm Lewis, Yockey & Brown.
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Summary
This private dam serves the primary purpose of flood risk reduction and recreation, with a maximum storage capacity of 147 acre-feet and a normal storage of 88 acre-feet. The dam, made of earth and stone materials, stands at a height of 15 feet and spans a length of 433 feet, offering flood protection to the surrounding area along the TRIB SANGAMON RIVER.
Managed by the Illinois Department of Natural Resources (IDNR), Conway Farm Subdivision Lake Dam has a significant hazard potential and a moderate risk assessment rating. The dam's spillway type is uncontrolled, with a spillway width of 21 feet. Despite its hazard potential, the condition assessment of the dam is currently not available, and the last inspection was conducted in September 2019, with a scheduled inspection frequency of every 3 years. The dam does not have outlet gates and has not been modified since its completion.
Overall, Conway Farm Subdivision Lake Dam plays a crucial role in flood risk reduction in the Champaign County area, providing both recreational opportunities and protection for the local community. Its strategic location and design make it a key infrastructure for water resource management and climate resilience in the region, highlighting the importance of maintaining and monitoring the dam to ensure its continued safety and effectiveness in mitigating flood risks.
Year Completed |
2004 |
Dam Length |
433 |
Dam Height |
15 |
River Or Stream |
TRIB SANGAMON RIVER |
Primary Dam Type |
Earth |
Surface Area |
11 |
Drainage Area |
227 |
Nid Storage |
147 |
Outlet Gates |
None |
Hazard Potential |
Significant |
Foundations |
Soil |
Nid Height |
15 |
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.
Conway Farm Subdivision Lake Dam