West Beaver Subwatershed Sta 40+06 #A Reservoir Report
Last Updated: December 14, 2025
West Beaver Subwatershed Sta 40+06 #A is a locally-owned earth dam in Monona, Iowa, designed by the USDA NRCS for purposes such as fire protection, stock watering, and flood risk reduction.
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Summary
Completed in 1961, this dam stands at a height of 43 feet and spans 328 feet in length, with a storage capacity of 80 acre-feet and a drainage area of 0.23 square miles. Situated along the TR-Beaver Creek in the Little Sioux River city, this dam serves as a vital infrastructure for the region's water resource management.
Managed by the Iowa DNR, this dam has a low hazard potential and a moderate risk assessment rating. While its condition is currently not rated, the dam's emergency action plan status and risk management measures remain unspecified. With a spillway type of "Uncontrolled" and no outlet gates or associated structures, the dam's primary function is to provide essential services while mitigating potential flood risks in its vicinity. Its geographic coordinates of 42.0107° N latitude and -95.8973° W longitude make it a significant landmark in the region for water resource and climate enthusiasts.
Overall, West Beaver Subwatershed Sta 40+06 #A serves as a crucial component of the local government's water management infrastructure in Monona, Iowa. With its historical significance dating back to 1961 and its continued relevance in providing multiple benefits to the community, this dam stands as a testament to the importance of sustainable water resource practices and climate resilience efforts. As efforts to enhance its condition and emergency preparedness continue, this dam remains a key feature in the region's water resource and climate adaptation strategies.
Year Completed |
1961 |
Dam Length |
328 |
Dam Height |
43 |
River Or Stream |
TR-BEAVER CREEK |
Primary Dam Type |
Earth |
Surface Area |
5 |
Drainage Area |
0.23 |
Nid Storage |
80 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
43 |
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.
West Beaver Subwatershed Sta 40+06 #A