Reed Subwatershed Site 1-1 Reservoir Report
Last Updated: December 14, 2025
Reed Subwatershed Site 1-1, located in Monona County, Iowa, is a flood risk reduction structure constructed in 1990 by the USDA NRCS.
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Summary
This earth dam stands at 33 feet in height and spans 598 feet in length, with a storage capacity of 109 acre-feet. The dam serves multiple purposes beyond flood risk reduction, including fire protection, stock pond, and small fish pond.
Managed by the Iowa DNR, Reed Subwatershed Site 1-1 is equipped with an uncontrolled spillway and has been assessed to have a low hazard potential. Despite not being rated for condition assessment, the structure is maintained to meet state regulatory standards, with regular inspections conducted to ensure its functionality. With a moderate risk assessment score of 3, this site plays a crucial role in managing water resources and mitigating potential risks in the area.
Enthusiasts of water resources and climate will find Reed Subwatershed Site 1-1 to be a significant asset in the region, showcasing innovative engineering for flood risk reduction and water management. With its strategic location along the TR-McMaster Creek, this structure not only provides essential protection against flooding but also supports ecosystem health and sustainability. As a key component of the local government's water infrastructure, this site exemplifies the importance of proactive measures in addressing climate-related challenges and safeguarding the community's well-being.
Year Completed |
1990 |
Dam Length |
598 |
Dam Height |
33 |
River Or Stream |
TR-MC MASTER CREEK |
Primary Dam Type |
Earth |
Surface Area |
6.6 |
Drainage Area |
0.84 |
Nid Storage |
109 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
33 |
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 |
Missouri River At Decatur
|
14900cfs |
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.
Reed Subwatershed Site 1-1