Upper Beaver Subwatershed Site 15-1 Reservoir Report
Last Updated: December 14, 2025
Upper Beaver Subwatershed Site 15-1, located in Monona, Iowa, is a captivating example of a local government-owned earth dam designed by USDA NRCS in 1966 for fire protection, stock, or small fish pond purposes.
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Summary
With a height of 54 feet and a length of 430 feet, this dam has a storage capacity of 264 acre-feet, serving as a flood risk reduction measure in the area. Situated on TR-Beaver Creek, this dam plays a crucial role in managing water resources in the region, with a surface area of 11.2 acres and a drainage area of 0.29 square miles.
Despite being classified as having a low hazard potential, the dam at Upper Beaver Subwatershed Site 15-1 is not currently rated for its condition. However, with state regulation, permitting, inspection, and enforcement in place by the Iowa Department of Natural Resources, the dam is regularly monitored for any potential risks. The risk assessment for this site is moderate (3), highlighting the importance of continued monitoring and risk management measures to ensure the safety and effectiveness of this water resource infrastructure. For water resource and climate enthusiasts, this site serves as a valuable case study in dam management and the intersection of water resource conservation and community safety.
Year Completed |
1966 |
Dam Length |
430 |
Dam Height |
54 |
River Or Stream |
TR-BEAVER CREEK |
Primary Dam Type |
Earth |
Surface Area |
11.2 |
Drainage Area |
0.29 |
Nid Storage |
264 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
54 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Maple River At Mapleton
|
323cfs |
Little Sioux River Near Turin
|
1040cfs |
Monona-Harrison Ditch Near Turin
|
158cfs |
Soldier River At Pisgah
|
112cfs |
West Fork Ditch At Hornick
|
80cfs |
Missouri River At Decatur
|
15500cfs |
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.
Upper Beaver Subwatershed Site 15-1