Scnoenjahn Dam Reservoir Report
Last Updated: December 15, 2025
Schnoenjahn Dam, located in Monona, Iowa, was completed in 1963 by the USDA NRCS and serves as a crucial water resource for the region.
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Summary
With a primary purpose of fire protection, stock, or small fish pond, the dam stands at 31 feet in height and has a storage capacity of 70 acre-feet. The dam's low hazard potential and moderate risk assessment make it a key component in managing water resources in the area.
Owned privately, Schnoenjahn Dam is regulated by the Iowa DNR and undergoes regular inspections, permitting, and enforcement to ensure its safety and functionality. Situated on the TR-MAPLE RIVER, the dam plays a vital role in water management and conservation efforts in the region. With a surface area of 2.5 acres and a drainage area of 0.39 square miles, the dam provides essential water storage and flood control capabilities.
Overall, Schnoenjahn Dam is a critical infrastructure for water resource management in Monona, Iowa. Its construction by the USDA NRCS and oversight by the Iowa DNR highlight its importance in maintaining water quality, ensuring public safety, and supporting various water-related activities in the area. The dam's design, purpose, and operational protocols contribute to its role in the sustainable management of water resources and climate resilience efforts in the region.
Year Completed |
1963 |
Dam Length |
493 |
Dam Height |
31 |
River Or Stream |
TR-MAPLE RIVER |
Primary Dam Type |
Earth |
Surface Area |
2.5 |
Drainage Area |
0.39 |
Nid Storage |
70 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
31 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Maple River At Mapleton
|
323cfs |
West Fork Ditch At Hornick
|
80cfs |
Little Sioux River Near Turin
|
1040cfs |
Monona-Harrison Ditch Near Turin
|
158cfs |
Little Sioux River At Correctionville
|
327cfs |
Soldier River At Pisgah
|
112cfs |
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.
Scnoenjahn Dam