Hadley Creek Ws Str 9-1 Reservoir Report
Last Updated: December 19, 2025
Hadley Creek WS Str 9-1, located in Adams, Illinois, is a privately owned earth dam designed by the USDA NRCS in 1958 for flood risk reduction along the TR- Hadley Creek NE river or stream.
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Summary
This 26-foot high structure with a length of 393 feet serves multiple purposes, including flood risk reduction and other functions, with a normal storage capacity of 18 acre-feet and a maximum discharge rate of 153 cubic feet per second. The dam is regulated by the Illinois Department of Natural Resources and inspected by the Natural Resources Conservation Service.
Despite being classified as having a low hazard potential, Hadley Creek WS Str 9-1 presents a moderate risk level, with a risk assessment rating of 3. The dam has an uncontrolled spillway type with a width of 26 feet and is associated with the Natural Resources Conservation Service for construction, inspection, and operations. The last inspection of the structure was conducted in July 2016, with an inspection frequency of 5 years, highlighting the importance of regular monitoring and maintenance to ensure its continued functionality and safety.
Overall, Hadley Creek WS Str 9-1 plays a crucial role in managing flood risks in the area and protecting surrounding communities from potential inundation events. As a key infrastructure designed over six decades ago, its maintenance and regulation by state agencies and federal entities are essential to ensure its effectiveness in flood risk reduction and water resource management for years to come.
Year Completed |
1958 |
Dam Length |
393 |
Dam Height |
26 |
River Or Stream |
TR- HADLEY CREEK NE |
Primary Dam Type |
Earth |
Surface Area |
3 |
Drainage Area |
0.07 |
Nid Storage |
30 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
26 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Bay Creek At Pittsfield
|
43cfs |
Illinois River At Valley City
|
2970cfs |
La Moine River At Ripley
|
33cfs |
Bear Creek At Hannibal
|
2cfs |
Salt River Near New London
|
82cfs |
Spencer Cr. Bl Plum Cr. Nr Frankford
|
24cfs |
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.
Hadley Creek Ws Str 9-1