Town Of Middletown Wastewater Lagoon Reservoir Report

Last Updated: December 5, 2025

The Town of Middletown Wastewater Lagoon is a gravity dam located in New Castle, Delaware, near the Deep Creek-Os river.


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Summary

This lagoon serves as a crucial water resource facility for the local government, with a storage capacity of 462 acre-feet and a surface area of 60 acres. Despite being classified as having a high hazard potential, the dam is currently in fair condition, with its last assessment conducted in July 2008.

Constructed with a height of 12.89 feet and a length of 2600 feet, the Town of Middletown Wastewater Lagoon plays a vital role in managing water resources in the region. It is primarily used for wastewater treatment purposes and does not have a spillway. While it is not regulated by the state, the dam is associated with high risks and is closely monitored for any potential hazards. Additionally, the dam does not have a designated emergency action plan in place as of the latest data update in May 2021.

Overall, the Town of Middletown Wastewater Lagoon is a significant infrastructure for water management in the area, despite its high risk potential. With a fair condition assessment and a storage capacity of 462 acre-feet, this gravity dam serves as a critical component of the local government's water resource infrastructure. As climate change continues to impact water resources, the maintenance and monitoring of facilities like this lagoon are essential to ensure the safety and sustainability of water systems in the region.

Dam Length

2600

Dam Height

12.89

River Or Stream

DEEP CREEK-OS

Primary Dam Type

Gravity

Surface Area

60

Drainage Area

1.34

Nid Storage

462

Outlet Gates

None

Hazard Potential

High

Foundations

Unlisted/Unknown

Nid Height

13
       
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.