Greenwood Dam Reservoir Report
Last Updated: December 14, 2025
Greenwood Dam, located in Missouri Valley, Iowa, was completed in 1996 by the USDA NRCS and serves multiple purposes including fire protection, stock, and small fish pond.
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Summary
The dam is classified as an earth dam with a height of 34 feet and a length of 217 feet, providing a storage capacity of 28 acre-feet. Situated on TR- Harris Grove Creek, the dam is regulated and inspected by the Iowa DNR, ensuring its safety and compliance with state regulations.
Despite being rated as low hazard potential and in moderate condition, Greenwood Dam has not been formally assessed for its current condition. With a controlled spillway and no outlet gates, the dam poses minimal risk to the surrounding area. The dam is privately owned and falls under the jurisdiction of the state of Iowa, with no federal agency involvement in its funding, design, construction, or operation. Overall, Greenwood Dam serves as a vital resource for water management in Harrison County, Iowa, demonstrating effective water storage and management practices.
Year Completed |
1996 |
Dam Length |
217 |
Dam Height |
34 |
River Or Stream |
TR- HARRIS GROVE CREEK |
Primary Dam Type |
Earth |
Surface Area |
1 |
Drainage Area |
0.11 |
Nid Storage |
28 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
34 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Boyer River At Logan
|
417cfs |
Soldier River At Pisgah
|
112cfs |
West Nishnabotna River At Hancock
|
154cfs |
Missouri River At Omaha
|
17700cfs |
Big Papillion Cr
|
38cfs |
Little Sioux River Near Turin
|
1040cfs |
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.
Greenwood Dam