Temporary Sangamon River Dam Reservoir Report
Last Updated: December 20, 2025
Located in Sangamon, Illinois, the Temporary Sangamon River Dam serves as a critical water supply structure designed by Crawford, Murphy & Tilly.
°F
°F
mph
Wind
%
Humidity
Summary
Owned by a public utility, this dam stands at a height of 20 feet with a length of 341 feet, providing a storage capacity of 2000 acre-feet. The dam, located on the Sangamon River, plays a crucial role in water resource management in the region, regulated by the Illinois Department of Natural Resources.
The dam features an uncontrolled spillway with a width of 275 feet and is classified as a low-hazard structure with a moderate risk assessment. While the condition assessment is currently unavailable, the dam undergoes inspections every five years to ensure its safety and functionality. With a primary purpose of water supply, the Temporary Sangamon River Dam contributes to the overall water management efforts in Springfield, Illinois, and is a key asset in the region's infrastructure.
Overall, the Temporary Sangamon River Dam stands as a vital water resource structure in Sangamon County, Illinois, providing essential water supply services to the local community. With its unique buttress core type and uncontrolled spillway design, the dam plays a crucial role in managing water flow and storage along the Sangamon River. As a publicly owned utility structure, the dam is subject to state jurisdiction and regulatory oversight, ensuring its continued operation and contribution to the region's water supply needs.
Dam Length |
341 |
Dam Height |
20 |
River Or Stream |
SANGAMON RIVER |
Primary Dam Type |
Other |
Nid Storage |
2000 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
20 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Sangamon River At Riverton
|
125cfs |
South Fork Sangamon River Nr Rochester
|
11cfs |
Spring Creek At Springfield
|
7cfs |
Lake Fork Near Cornland
|
17cfs |
Sangamon River At Petersburg
|
209cfs |
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.
Temporary Sangamon River Dam