East Aldrich Subwatershed B-6603 Reservoir Report
Last Updated: December 14, 2025
East Aldrich Subwatershed B-6603 in Danbury, Iowa, is a critical water resource managed by the USDA NRCS, with a dam completed in 1954 primarily for fire protection, stock, and small fish pond purposes.
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Summary
This earth dam stands at 35 feet in height, providing a storage capacity of 138 acre-feet and covering an 8-acre surface area. Despite its low hazard potential, the subwatershed is regulated and permitted by the Iowa DNR, ensuring regular inspections and enforcement to maintain its structural integrity.
Located in Ida County, the subwatershed's Aldrich Creek tributary plays a vital role in flood risk reduction for the surrounding area. With a drainage area of 0.73 square miles, the dam controls the flow of water and manages the risk of inundation, contributing to a moderate risk assessment score of 3. Although the condition assessment is currently not rated, the subwatershed's management measures and emergency protocols are in place to address any potential issues and ensure the safety of the community.
As part of the Rock Island District, East Aldrich Subwatershed B-6603 serves as a prime example of sustainable water resource management in the region. With its strategic design by the Natural Resources Conservation Service and state-regulated operations, the subwatershed showcases a collaborative effort to protect the environment, support local agriculture, and mitigate the impacts of climate change on water resources.
Year Completed |
1954 |
Dam Height |
35 |
River Or Stream |
TR- ALDRICH CREEK |
Primary Dam Type |
Earth |
Surface Area |
8 |
Drainage Area |
0.73 |
Nid Storage |
138 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
35 |
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-6603