Mosquito Of Harrison Watershed Site C-1 Reservoir Report
Last Updated: December 13, 2025
Mosquito of Harrison Watershed Site C-1 is a local government-owned dam located in Neola, Iowa, along the Mosquito Creek.
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Summary
Built in 1990 by the USDA NRCS, this earth dam stands at a height of 27 feet and has a length of 583 feet, providing fire protection, stock, or small fish pond purposes. With a storage capacity of 26 acre-feet, the dam covers a surface area of 1.1 acres and serves a drainage area of 2.11 square miles. Despite its low hazard potential and moderate risk assessment, the condition of Mosquito of Harrison Watershed Site C-1 has not been officially rated, leaving its safety and maintenance status unclear.
Managed by the Iowa DNR, this dam has state jurisdiction, permitting, inspection, and enforcement, ensuring its compliance with regulatory standards. Although it has not been inspected recently, the dam's risk is considered moderate, with no emergency action plan in place. While the dam's primary purpose is for fire protection and small-scale water retention, it also contributes to flood risk reduction in the area. With its uncontrolled spillway and soil foundation, Mosquito of Harrison Watershed Site C-1 serves as a vital structure in the local water resource management system, safeguarding the community against potential water-related hazards.
Year Completed |
1990 |
Dam Length |
583 |
Dam Height |
27 |
River Or Stream |
TR-MOSQUITO CREEK |
Primary Dam Type |
Earth |
Surface Area |
1.1 |
Drainage Area |
2.11 |
Nid Storage |
26 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
27 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Boyer River At Logan
|
417cfs |
West Nishnabotna River At Hancock
|
154cfs |
Missouri River At Omaha
|
17700cfs |
Soldier River At Pisgah
|
112cfs |
East Nishnabotna River Near Atlantic
|
143cfs |
Big Papillion Cr
|
38cfs |
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.
Mosquito Of Harrison Watershed Site C-1