Grell Pond Dam Reservoir Report
Nearby: Van Kekerix Dam Knop Dam
Last Updated: December 13, 2025
Grell Pond Dam, located in Ida County, Iowa, was completed in 1958 by the USDA NRCS and serves multiple purposes including fire protection, stock, and small fish pond.
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Summary
The earth dam stands at 26 feet tall and spans 387 feet in length, with a storage capacity of 109 acre-feet and a surface area of 6.1 acres. The dam is regulated and inspected by the Iowa DNR, with a significant hazard potential and a poor condition assessment as of December 2015.
Despite its age and condition, Grell Pond Dam continues to play a crucial role in water resource management in the area. The dam's location near the TR-MAPLE River provides valuable flood control and water storage capabilities for the surrounding community. However, with a risk assessment rating of moderate, there is a need for ongoing risk management measures to ensure the safety and effectiveness of the dam in the face of changing climate patterns and increasing water resource demands.
As a private-owned structure, Grell Pond Dam is a vital asset for its owners and the local ecosystem. With its historical significance and functional purpose, the dam represents a connection to the past while also highlighting the importance of sustainable water resource management practices in the present day. Climate enthusiasts and water resource experts alike can appreciate the role that Grell Pond Dam plays in protecting the environment and supporting the needs of the community in a changing climate landscape.
Year Completed |
1958 |
Dam Length |
387 |
Dam Height |
26 |
River Or Stream |
TR-MAPLE RIVER |
Primary Dam Type |
Earth |
Surface Area |
6.1 |
Drainage Area |
0.54 |
Nid Storage |
109 |
Hazard Potential |
Significant |
Foundations |
Soil |
Nid Height |
26 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Little Sioux River At Correctionville
|
327cfs |
Maple River At Mapleton
|
323cfs |
North Raccoon River Near Sac City
|
312cfs |
West Fork Ditch At Hornick
|
80cfs |
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.
Grell Pond Dam