Mosquito Creek Dam Reservoir Report

Last Updated: December 5, 2025

Mosquito Creek Dam, also known as Mosquito Creek Lake, is a Federal-owned structure located in Trumbull County, Ohio.


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Summary

Completed in 1944 by the US Army Corps of Engineers, the dam serves as a flood risk reduction measure along the Mosquito Creek. Standing at a structural height of 47 feet with a total length of 5650 feet, the dam has a storage capacity of 180,000 acre-feet and covers a surface area of 7850 acres.

Despite its risk management measures, the dam poses a high hazard potential with a moderate risk assessment due to the possibility of erosion of its soil foundation during high reservoir levels. If a breach were to occur, downstream communities such as Warren and Niles could face swift and deep floodwaters, potentially resulting in the destruction of buildings and key infrastructure. To mitigate these risks, the US Army Corps of Engineers continues to work closely with state and local emergency managers, conduct emergency exercises, monitor the dam rigorously, and provide flood warnings based on rainfall forecasts.

In the event of high reservoir levels, the public can access current and forecasted lake levels at Pittsburgh District reservoirs through the US Geologic Survey and the National Weather Service. By engaging with local communities and providing flood preparedness information, the dam aims to enhance public awareness and readiness for potential flood events, ensuring the safety of residents in the surrounding areas.

Year Completed

1944

Dam Length

5650

River Or Stream

MOSQUITO CREEK

Primary Dam Type

Earth

Surface Area

7850

Hydraulic Height

43

Drainage Area

97

Nid Storage

180000

Structural Height

47

Outlet Gates

Slide (sluice gate) - 9

Hazard Potential

High

Foundations

Soil

Nid Height

47
       
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.