Upper Beaver Subwatershed Site 51-1 Reservoir Report
Last Updated: December 13, 2025
Upper Beaver Subwatershed Site 51-1, located in Monona, Iowa, is a vital resource managed by the local government for fire protection, stock, and small fish pond purposes.
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Summary
Built in 1968 by the USDA NRCS, this earth dam stands at 36 feet in height and has a storage capacity of 19 acre-feet. Situated on the TR-Beaver Creek, this structure plays a crucial role in flood risk reduction for the area.
With a low hazard potential and a moderate risk assessment rating, Upper Beaver Subwatershed Site 51-1 is a key component in the water resource management of the region. Although the condition assessment is not rated, the dam is regulated and inspected by the Iowa DNR, ensuring its functionality and safety. The surrounding community in Little Sioux benefits from this structure, which covers a drainage area of 0.1 square miles and has a surface area of 2 acres.
Overall, Upper Beaver Subwatershed Site 51-1 serves as a valuable asset in the water resource management of Monona, Iowa, providing essential functions for fire protection, stock, and fish pond activities. With its controlled spillway type and regulated operations, this earth dam contributes to flood risk reduction and ensures the safety of the surrounding area. Supported by the local government and designed by the USDA NRCS, this structure plays a critical role in maintaining the ecological balance of the region.
Year Completed |
1968 |
Dam Height |
36 |
River Or Stream |
TR-BEAVER CREEK |
Primary Dam Type |
Earth |
Surface Area |
2 |
Drainage Area |
0.1 |
Nid Storage |
19 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
36 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Little Sioux River Near Turin
|
1040cfs |
Monona-Harrison Ditch Near Turin
|
158cfs |
Maple River At Mapleton
|
323cfs |
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 51-1