East Fork Grand River Watershed Site A-46 Reservoir Report
Last Updated: December 13, 2025
Located in Ringgold County, Iowa, the East Fork Grand River Watershed Site A-46 is a Grade Stabilization structure designed by the USDA NRCS in 2001.
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Summary
This earth dam stands at a height of 21 feet and spans a length of 428 feet, with a storage capacity of 60 acre-feet and a drainage area of 0.16 square miles. Serving as a key component in managing water resources in the area, the dam's primary purpose is to prevent erosion and control stream flow on Tr-Hackberry Creek.
Managed by the Iowa DNR, this site is regulated, permitted, inspected, and enforced by state authorities to ensure its safe operation. With a low hazard potential and a moderate risk assessment rating, the structure is currently in a not-rated condition. Despite its critical role in managing water resources, the dam has not undergone recent inspections or updates to its emergency action plan. As part of the Rock Island District, the East Fork Grand River Watershed Site A-46 serves as a vital infrastructure for water resource management in the region, highlighting the importance of maintaining and monitoring such structures to ensure their long-term effectiveness and safety.
Year Completed |
2001 |
Dam Length |
428 |
Dam Height |
21 |
River Or Stream |
Tr- Hackberry Creek |
Primary Dam Type |
Earth |
Surface Area |
3.5 |
Drainage Area |
0.16 |
Nid Storage |
60 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
21 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
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 Fork Grand River Watershed Site A-46