Hopp Dam Reservoir Report
Nearby: Staley & Rae Dam Lincoln Dam
Last Updated: December 16, 2025
Hopp Dam, located in Charter Oak, Iowa, is a privately owned structure designed by the NRCS with a primary purpose of providing fire protection, stock, or a small fish pond.
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Summary
Completed in 2006, this earth dam stands at a height of 27 feet and has a length of 410 feet, with a storage capacity of 67 acre-feet. Situated on TR-Emigrant Creek, the dam serves as a crucial water resource for the surrounding area, with a surface area of 3.9 acres and a drainage area of 0.34 square miles.
Despite its low hazard potential and moderate risk assessment, Hopp Dam is regulated by the Iowa Department of Natural Resources, with permitting, inspection, and enforcement measures in place. The dam features an uncontrolled spillway with a width of 2 feet, and although it has not been rated for its current condition, it plays a vital role in water management for fire protection and agricultural purposes in Crawford County, Iowa. With its strategic location and reliable infrastructure, Hopp Dam remains a key asset in the region's water resource and climate management efforts.
Year Completed |
2006 |
Dam Length |
410 |
Dam Height |
27 |
River Or Stream |
TR- EMIGRANT CREEK |
Primary Dam Type |
Earth |
Surface Area |
3.9 |
Drainage Area |
0.34 |
Nid Storage |
67 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
27 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Maple River At Mapleton
|
323cfs |
Little Sioux River Near Turin
|
1040cfs |
Monona-Harrison Ditch Near Turin
|
158cfs |
Soldier River At Pisgah
|
112cfs |
West Fork Ditch At Hornick
|
80cfs |
Little Sioux River At Correctionville
|
327cfs |
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.
Hopp Dam