Spencer Dam Reservoir Report
Last Updated: December 14, 2025
Spencer Dam, located in Harrison County, Iowa, is a privately-owned earth dam completed in 2007 for the primary purposes of fire protection, stock, or small fish pond.
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Summary
With a height of 47 feet and a length of 378 feet, the dam holds a maximum storage capacity of 93 acre-feet and covers a surface area of 4.2 acres. Situated on TR- Harris Grove Creek, the dam is regulated by the Iowa Department of Natural Resources and is subject to state permitting, inspection, and enforcement.
Despite being classified as having a low hazard potential, Spencer Dam is deemed to have a moderate risk level due to various factors such as its location and structural characteristics. Although the condition assessment is currently marked as "Not Rated," the dam's risk management measures and emergency action plans are not fully documented. The dam is equipped with an uncontrolled spillway and has not experienced any significant modifications since its completion. While there have been no reported incidents or inspections in recent years, the dam remains an important asset for water resource management in the area.
Water resource and climate enthusiasts will find Spencer Dam to be an intriguing structure with its unique design and purpose. With its location on Harris Grove Creek and proximity to Missouri Valley, the dam serves as a vital resource for fire protection and water storage in the region. While it may pose a moderate risk level, the dam's low hazard potential and state-regulated status demonstrate a commitment to ensuring its safety and functionality for the surrounding community.
Year Completed |
2007 |
Dam Length |
378 |
Dam Height |
47 |
River Or Stream |
TR- HARRIS GROVE CREEK |
Primary Dam Type |
Earth |
Surface Area |
4.2 |
Drainage Area |
0.3 |
Nid Storage |
93 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
47 |
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.
Spencer Dam