East Aldrich Subwatershed B-4780 Reservoir Report
Last Updated: December 14, 2025
The East Aldrich Subwatershed B-4780 in Iowa is a local government-owned structure designed by the USDA NRCS for fire protection, stock, or small fish pond purposes.
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Summary
This earth dam, completed in 1954, has a height of 40 feet and a storage capacity of 98 acre-feet. Located in Danbury, Iowa, this dam on Aldrich Creek serves multiple functions including flood risk reduction.
With a low hazard potential and a moderate risk assessment rating, the East Aldrich Subwatershed B-4780 dam is regulated by the Iowa DNR and meets state jurisdiction, permitting, inspection, and enforcement requirements. The dam has not been rated for its condition assessment, and emergency preparedness measures such as an Emergency Action Plan (EAP) and inundation maps have not been reported. Despite these gaps, the structure plays a crucial role in water resource management and climate resilience in the area.
Year Completed |
1954 |
Dam Height |
40 |
River Or Stream |
TR- ALDRICH CREEK |
Primary Dam Type |
Earth |
Surface Area |
5 |
Drainage Area |
0.33 |
Nid Storage |
98 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
40 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Little Sioux River At Correctionville
|
327cfs |
Maple River At Mapleton
|
323cfs |
West Fork Ditch At Hornick
|
80cfs |
North Raccoon River Near Sac City
|
312cfs |
Little Sioux River Near Turin
|
1040cfs |
Monona-Harrison Ditch Near Turin
|
158cfs |
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.
East Aldrich Subwatershed B-4780