U-B Subwatershed Site 2c-1 Reservoir Report
Last Updated: December 13, 2025
U-B Subwatershed Site 2c-1, located in Monona, Iowa, is a dam with a primary purpose of fire protection, stock, or small fish pond, as well as flood risk reduction.
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Summary
Built in 1962 by the USDA NRCS, this earth dam stands at 34 feet high and spans 238 feet in length, with a storage capacity of 45 acre-feet. Situated on TR-BEAVER CREEK, it serves as a crucial water management structure in the region.
Managed by the Iowa DNR, U-B Subwatershed Site 2c-1 is state-regulated, permitted, inspected, and enforced to ensure its safety and functionality. With a low hazard potential and moderate risk assessment rating, this dam plays a significant role in water resource management and emergency preparedness for the surrounding area. While it currently holds a "Not Rated" condition assessment, ongoing risk management measures are in place to maintain its integrity.
Despite being last inspected in 1963, U-B Subwatershed Site 2c-1 remains a key feature in the local water infrastructure, providing essential services such as flood control and water storage. With its strategic location and design, this dam continues to support the community's water resource needs while mitigating potential risks associated with its operation.
Year Completed |
1962 |
Dam Length |
238 |
Dam Height |
34 |
River Or Stream |
TR-BEAVER CREEK |
Primary Dam Type |
Earth |
Surface Area |
2.9 |
Drainage Area |
0.19 |
Nid Storage |
45 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
34 |
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.
U-B Subwatershed Site 2c-1