Mosquito Of Harrison Watershed Site 5-3 Reservoir Report

Last Updated: December 13, 2025

Located in Neola, Iowa, the Mosquito of Harrison Watershed Site 5-3 is a primary dam designed by the USDA NRCS with a height of 40 feet and a length of 875 feet.


°F

°F

mph

Wind

%

Humidity

Summary

Completed in 1988, this earth dam serves multiple purposes including fire protection, stock, small fish pond, and flood risk reduction. The dam has a storage capacity of 314 acre-feet, with a normal storage of 73 acre-feet and a surface area of 10.6 acres.

Managed by the Iowa DNR, this dam on the TR- Mosquito Creek is regulated, permitted, inspected, and enforced by state agencies to ensure its safety and functionality. With a low hazard potential and a moderate risk assessment rating, the Mosquito of Harrison Watershed Site 5-3 provides essential water resource management for the area. Despite not being rated for condition assessment, the dam remains a crucial asset for the community's water supply and flood control needs.

As part of the Rock Island District, the Mosquito of Harrison Watershed Site 5-3 boasts a controlled spillway and a soil foundation. Its location in Harrison County, Iowa, highlights its importance in maintaining water quality and quantity for the surrounding area. Climate and water resource enthusiasts will appreciate the detailed information available for this dam, showcasing its role in sustainable water management practices.

Year Completed

1988

Dam Length

875

Dam Height

40

River Or Stream

TR- MOSQUITO CREEK

Primary Dam Type

Earth

Surface Area

10.6

Drainage Area

0.66

Nid Storage

314

Hazard Potential

Low

Foundations

Soil

Nid Height

40
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.