Mosquito Of Harrison Watershed Site 5-4 Reservoir Report
Last Updated: December 13, 2025
Located in the Harrison Watershed in Neola, Iowa, Mosquito of Harrison Watershed Site 5-4 is a vital water resource managed by the USDA NRCS.
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Summary
This earth dam, completed in 1988, serves multiple purposes including fire protection, stock watering, and flood risk reduction. With a dam height of 45 feet and a storage capacity of 227 acre-feet, the structure plays a crucial role in managing water levels and protecting the surrounding area.
Despite its low hazard potential, the dam is regulated by the Iowa Department of Natural Resources and undergoes regular inspections to ensure its structural integrity. The risk assessment for the site is moderate, indicating the need for ongoing monitoring and potential risk management measures. With a drainage area of 0.47 square miles and a surface area of 6.7 acres, Mosquito of Harrison Watershed Site 5-4 is a key component of the local water management system.
In the event of an emergency, the dam is equipped with an uncontrolled spillway to manage excess water flow. While the condition of the dam is currently not rated, its importance for fire protection, livestock, and flood control underscores the need for continued oversight and maintenance to safeguard this valuable water resource for the community of Neola and beyond.
Year Completed |
1988 |
Dam Length |
390 |
Dam Height |
45 |
River Or Stream |
TR- MOSQUITO CREEK |
Primary Dam Type |
Earth |
Surface Area |
6.7 |
Drainage Area |
0.47 |
Nid Storage |
227 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
45 |
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 5-4