Il & Ic Dam Reservoir Report
Nearby: Jefferson Park Dam Stever Dam
Last Updated: December 6, 2025
Il & Ic Dam, located in Jefferson, Iowa, along TR-Cedar Creek, is a private dam with a primary purpose of recreation.
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Summary
Constructed in 1992 with a height of 8 feet and a length of 4460 feet, this earth dam provides a storage capacity of 98 acre-feet and covers a surface area of 20.8 acres. While the dam is regulated by the Iowa DNR and subject to state jurisdiction, it has a low hazard potential and is currently rated as 'Not Rated' in terms of condition assessment.
Despite its moderate risk level, Il & Ic Dam plays a crucial role in providing recreational opportunities for the local community in Oakland Mills. With a scenic setting and easy access, the dam offers a peaceful retreat for water resource and climate enthusiasts to enjoy activities such as fishing, boating, and wildlife observation. As a well-maintained structure, the dam is a valuable asset for both the environment and the community, contributing to the overall sustainability and resilience of the region's water resources.
Year Completed |
1992 |
Dam Length |
4460 |
Dam Height |
8 |
River Or Stream |
TR-CEDAR CREEK |
Primary Dam Type |
Earth |
Surface Area |
20.8 |
Drainage Area |
0.29 |
Nid Storage |
98 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
8 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Des Moines River At Keosauqua
|
1800cfs |
Cedar Creek Near Oakland Mills
|
10cfs |
Des Moines River At Ottumwa
|
1090cfs |
Big Creek Near Mt. Pleasant
|
0cfs |
North Skunk River Near Sigourney
|
97cfs |
Fox River At Bloomfield
|
7cfs |
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.
Il & Ic Dam