Lower Beaver Subwtrshd Sta 80+04 #7a Reservoir Report
Last Updated: December 14, 2025
Lower Beaver Subwatershed Station 80+04 #7a is a crucial water resource structure located in Monona, Iowa, designed by USDA NRCS to serve multiple purposes such as fire protection, stock, small fish pond, and flood risk reduction.
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Summary
This earth dam, completed in 1965, stands at 26 feet tall and spans 679 feet in length, with a storage capacity of 99 acre-feet. Situated on TR-Beaver Creek, this structure covers a drainage area of 1.15 square miles and maintains a normal storage level of 37 acre-feet over a surface area of 6.5 acres.
Owned and regulated by the Iowa Department of Natural Resources, Lower Beaver Subwatershed Station 80+04 #7a is subject to regular state permitting, inspection, and enforcement to ensure its functionality and safety. Classified as having a low hazard potential, this dam is rated as "Not Rated" in terms of condition assessment, with moderate risk due to its location and purpose. While lacking in detailed risk management measures and emergency action planning, this structure plays a vital role in water resource management and protection in the area.
Despite its relatively low hazard potential, the Lower Beaver Subwatershed Station 80+04 #7a remains a critical infrastructure for water storage, flood risk reduction, and wildlife habitat in Monona, Iowa. With its long history of service since 1965, this earth dam continues to be a key element in the local water resource system, serving the community's needs for fire protection, livestock, and small fish pond while actively contributing to the management of flood risks in the region.
Year Completed |
1965 |
Dam Length |
679 |
Dam Height |
26 |
River Or Stream |
TR-BEAVER CREEK |
Primary Dam Type |
Earth |
Surface Area |
6.5 |
Drainage Area |
1.15 |
Nid Storage |
99 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
26 |
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 80+04 #7a