Greenland Dam Reservoir Report
Last Updated: December 13, 2025
Greenland Dam, located in Ringgold County, Iowa, is a privately owned earth dam completed in 1999 for fire protection, stock, or small fish pond purposes.
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Summary
The dam stands at a height of 33 feet and is 662 feet long, with a storage capacity of 139 acre-feet. Situated on TR-Walnut Creek, this dam plays a crucial role in water resource management in the area, providing irrigation and recreational opportunities while also serving as a source of emergency water supply.
Managed by the Iowa Department of Natural Resources, Greenland Dam has a low hazard potential and is currently rated as "Not Rated" in terms of condition assessment. Despite its moderate risk level, the dam has not undergone recent inspections or assessments, highlighting the need for regular maintenance and monitoring to ensure its structural integrity. With a spillway type of "Uncontrolled" and a spillway width of 1 foot, the dam's design and construction by NRCS reflect a commitment to sustainable water management practices in the region.
Located in the city of Delphos, Greenland Dam is a vital component of the local watershed, providing flood control and water storage benefits for the surrounding community. As climate change continues to impact water resources and infrastructure, the need for effective dam management and maintenance becomes increasingly important to ensure the safety and reliability of water supplies for both human and ecological needs. Greenland Dam stands as a testament to the intersection of water resource management, climate resilience, and environmental stewardship in the face of evolving challenges.
Year Completed |
1999 |
Dam Length |
662 |
Dam Height |
33 |
River Or Stream |
TR- WALNUT CREEK |
Primary Dam Type |
Earth |
Surface Area |
10.3 |
Drainage Area |
0.14 |
Nid Storage |
139 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
33 |
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.
Greenland Dam