Glen Ellen Subwatershed Site 3-1 Reservoir Report
Last Updated: December 13, 2025
Located in Woodbury County, Iowa, the Glen Ellen Subwatershed Site 3-1 is a key water resource managed by the local government.
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Summary
Designated as a dam for fire protection, stock, or small fish pond purposes, this earth-type structure was completed in 1963 and stands at a height of 29 feet with a length of 615 feet. With a normal storage capacity of 14 acre-feet and a maximum storage capacity of 122 acre-feet, this site plays a crucial role in flood risk reduction for the area.
Managed by the USDA NRCS, this site on TR-Farmers Ditch in Bronson, Iowa, is regulated by the Iowa DNR and undergoes regular inspections to ensure its structural integrity. Despite being categorized as having a high hazard potential, the condition assessment conducted in August 2020 deemed the dam to be in satisfactory condition, with a moderate risk level. With a notable surface area of 3.1 acres and a drainage area of 0.3 square miles, this site serves as a vital component of water resource management in the region.
With its uncontrolled spillway and a risk management plan in place, the Glen Ellen Subwatershed Site 3-1 is a crucial infrastructure in maintaining water quality and quantity in the area. As a focal point for fire protection, stock management, and flood risk reduction, this dam showcases the importance of sustainable water resource practices and the collaborative efforts between local government agencies and the USDA NRCS to ensure the safety and well-being of the surrounding community.
Year Completed |
1963 |
Dam Length |
615 |
Dam Height |
29 |
River Or Stream |
TR-FARMERS DITCH |
Primary Dam Type |
Earth |
Surface Area |
3.1 |
Drainage Area |
0.3 |
Nid Storage |
122 |
Hazard Potential |
High |
Nid Height |
29 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Missouri River At Sioux City
|
15100cfs |
Omaha Cr At Homer
|
45cfs |
Floyd River At James
|
187cfs |
West Fork Ditch At Hornick
|
80cfs |
Perry Creek Near Milnerville
|
25cfs |
South Omaha Creek At Walthill
|
11cfs |
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.
Glen Ellen Subwatershed Site 3-1
Dakota City