West Beaver Subwatershed Sta 33+30 Reservoir Report
Last Updated: December 13, 2025
Located in Monona, Iowa, the West Beaver Subwatershed Sta 33+30 is a local government-owned earth dam completed in 1961 by the USDA NRCS.
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Summary
This dam serves multiple purposes including fire protection, stock, small fish pond, and flood risk reduction for the Little Sioux River. With a height of 44 feet and a storage capacity of 80 acre-feet, this dam covers a drainage area of 0.28 square miles and spans 266 feet in length. Despite its low hazard potential, the dam's risk assessment is classified as moderate (3), indicating a need for ongoing monitoring and maintenance.
The West Beaver Subwatershed Sta 33+30 is regulated by the Iowa DNR and falls under the jurisdiction of the state, with permitting, inspection, and enforcement carried out by the relevant state agencies. The dam's primary purpose is to provide essential water resources for the surrounding area, while also contributing to flood risk reduction efforts. As part of the Rock Island District, this dam plays a crucial role in managing water flow along the TR-Beaver Creek, ensuring the safety and resilience of the local community in the face of changing climate patterns and extreme weather events.
Despite its relatively small surface area of 5.4 acres, the West Beaver Subwatershed Sta 33+30 serves as a vital infrastructure for water management in Monona, Iowa. With a focus on fire protection, livestock, and fish pond maintenance, this dam contributes to the sustainability and resilience of the local ecosystem. As water resource and climate enthusiasts, understanding the significance of structures like the West Beaver Subwatershed Sta 33+30 is key to promoting effective water management practices and mitigating the impacts of climate change on our environment.
Year Completed |
1961 |
Dam Length |
266 |
Dam Height |
44 |
River Or Stream |
TR-BEAVER CREEK |
Primary Dam Type |
Earth |
Surface Area |
5.4 |
Drainage Area |
0.28 |
Nid Storage |
80 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
44 |
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 33+30