Lower Beaver Subwtrshd Sta 21+00 #2 Reservoir Report
Last Updated: December 14, 2025
Lower Beaver Subwtrshd Sta 21+00 #2, located in Monona, Iowa, is a dam constructed in 1965 by the USDA NRCS for fire protection, stock, and small fish pond purposes.
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Summary
With a dam height of 43 feet and a length of 506 feet, this earth dam has a storage capacity of 53 acre-feet and serves the Little Sioux River. The dam covers a surface area of 3.7 acres and has a drainage area of 0.18 square miles.
Managed by the local government, the dam is regulated by the Iowa DNR and undergoes state inspections and enforcement. With a low hazard potential and a moderate risk assessment rating, the dam currently has a condition assessment of "Not Rated." While the dam does not feature a controlled spillway, it is designed for flood risk reduction in the area. Despite not having associated structures or inspection frequency data available, Lower Beaver Subwtrshd Sta 21+00 #2 plays a crucial role in water resource management and climate resilience efforts in the region.
Water resource and climate enthusiasts will find Lower Beaver Subwtrshd Sta 21+00 #2 an essential infrastructure for fire protection, livestock, and pond purposes. As a part of the local government's efforts in flood risk reduction, this earth dam stands as a vital component in safeguarding the Little Sioux River and its surrounding environment. With its historical significance dating back to 1965 and its state-regulated operations, this dam serves as a valuable resource in the region's water management strategies.
Year Completed |
1965 |
Dam Length |
506 |
Dam Height |
43 |
River Or Stream |
TR-LITTLE SIOUX RIVER |
Primary Dam Type |
Earth |
Surface Area |
3.7 |
Drainage Area |
0.18 |
Nid Storage |
53 |
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 |
Soldier River At Pisgah
|
112cfs |
Maple River At Mapleton
|
323cfs |
Missouri River At Decatur
|
14900cfs |
West Fork Ditch At Hornick
|
80cfs |
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.
Lower Beaver Subwtrshd Sta 21+00 #2