Carlinville Lake Ii Dam Reservoir Report
Nearby: Lake Williamson Dam Craig Pond Dam 1
Last Updated: January 12, 2026
Carlinville Lake II Dam, located in Macoupin, Illinois, was completed in 1981 and serves as a crucial water supply source for the local community.
°F
°F
mph
Wind
%
Humidity
Summary
Owned by the Local Government and regulated by the Illinois Department of Natural Resources, this earth dam stands at a height of 50 feet and has a storage capacity of 3400 acre-feet. The dam, designed by Hanson Engineers, spans 645 feet in length and is primarily used for water supply purposes, with an uncontrolled spillway and outlet gates.
With a significant hazard potential and a moderate risk assessment rating, Carlinville Lake II Dam undergoes regular inspections every three years to ensure its structural integrity. The dam is situated on the Trib Honey Creek and falls under the jurisdiction of the St. Louis District of the US Army Corps of Engineers. Although the condition assessment is currently not available, the dam's emergency action plan status, inundation maps, and risk management measures are all pending updates. Overall, Carlinville Lake II Dam plays a vital role in water resource management in the region and is a key component of the local infrastructure for maintaining a reliable water supply.
Year Completed |
1981 |
Dam Length |
645 |
Dam Height |
50 |
River Or Stream |
TRIB HONEY CREEK |
Primary Dam Type |
Earth |
Nid Storage |
3400 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
Significant |
Foundations |
Unlisted/Unknown |
Nid Height |
50 |
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.
Carlinville Lake Ii Dam