West Beaver Subwatershed Sta 51+80 Reservoir Report
Last Updated: December 14, 2025
West Beaver Subwatershed Sta 51+80 is a dam located in Monona, Iowa, serving multiple purposes including fire protection, stock, small fish pond, and flood risk reduction.
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Summary
Built in 1961 by USDA NRCS, this earth dam stands at a height of 39 feet and spans a length of 900 feet, with a normal storage capacity of 63 acre-feet. The dam is regulated by the Iowa DNR and is designed to manage water flow along TR-BEAVER CREEK, a tributary of the Little Sioux River.
With a low hazard potential and a moderate risk assessment rating, West Beaver Subwatershed Sta 51+80 has not been condition-rated, but is inspected, permitted, and enforced by the state regulatory agency. The dam is equipped with an uncontrolled spillway and is located in a rural area with a drainage area of 0.67 square miles. While the dam has not been modified in recent years, it remains an essential structure for water resource management in the region. Enthusiasts of water resources and climate will find West Beaver Subwatershed Sta 51+80 to be an intriguing example of how infrastructure plays a vital role in maintaining water security and mitigating flood risks in the area.
Year Completed |
1961 |
Dam Length |
900 |
Dam Height |
39 |
River Or Stream |
TR-BEAVER CREEK |
Primary Dam Type |
Earth |
Surface Area |
7.1 |
Drainage Area |
0.67 |
Nid Storage |
149 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
39 |
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 51+80