Johnson Dam Site 2 Reservoir Report
Last Updated: December 12, 2025
Johnson Dam Site 2, located in Fairfield, Iowa, is a privately owned earth dam completed in 1993 with a primary purpose of fire protection and serving as a stock or small fish pond.
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Summary
The dam, standing at 26 feet high and spanning 445 feet in length, has a storage capacity of 43 acre-feet with a normal storage level of 27 acre-feet. Situated on TR- Mitchell Creek, the dam has a low hazard potential and a moderate risk assessment rating.
Managed by the Iowa Department of Natural Resources, Johnson Dam Site 2 is subject to state regulation, inspection, and enforcement. With a drainage area of 0.08 square miles and a surface area of 4.1 acres, the dam plays a crucial role in water resource management in the region. Despite not having a designated emergency action plan (EAP) or a condition assessment rating, the dam remains a vital infrastructure for the local community, ensuring fire protection and serving as a valuable water resource for agricultural and recreational purposes.
Year Completed |
1993 |
Dam Length |
445 |
Dam Height |
26 |
River Or Stream |
TR- MITCHELL CREEK |
Primary Dam Type |
Earth |
Surface Area |
4.1 |
Drainage Area |
0.08 |
Nid Storage |
43 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
26 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
North Skunk River Near Sigourney
|
97cfs |
Cedar Creek Near Oakland Mills
|
10cfs |
Des Moines River At Ottumwa
|
1090cfs |
Des Moines River At Keosauqua
|
1800cfs |
Big Creek Near Mt. Pleasant
|
0cfs |
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.
Johnson Dam Site 2