Wyoming Lake Dam Reservoir Report

Last Updated: December 5, 2025

Wyoming Lake Dam in Dover, Delaware, stands as a historic structure completed in 1925 for the primary purpose of recreation.


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Summary

The dam, with a height of 13.03 feet and a length of 725 feet, holds a maximum storage capacity of 669 acre-feet, providing essential water resources for the area. Situated on Isaac Branch, the dam's controlled spillway, along with four slide gates, ensures proper water management and flood control.

Despite its fair condition assessment as of July 2008, Wyoming Lake Dam poses a high hazard potential, warranting regular inspections and risk management measures. The dam's location in Kent County, Delaware, underlines its critical role in water resource management for the region, with a surface area of 48.2 acres and a drainage area of 11.08 square miles. With Lisa Blunt Rochester (D) as the congressional representative for the area, the dam's structural integrity and emergency preparedness remain key concerns for water resource and climate enthusiasts alike.

As a gravity dam with a buttress core type, Wyoming Lake Dam serves as a significant recreational and water management asset in the region. Its very high risk assessment rating highlights the importance of continued monitoring and maintenance to ensure the safety and sustainability of the dam for future generations. For water resource and climate enthusiasts, Wyoming Lake Dam stands as a focal point for understanding the intersection of infrastructure, water management, and environmental stewardship in Delaware's landscape.

Year Completed

1925

Dam Length

725

Dam Height

13.03

River Or Stream

ISAAC BRANCH

Primary Dam Type

Gravity

Surface Area

48.2

Drainage Area

11.08

Nid Storage

669

Outlet Gates

Slide (sluice gate) - 4

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.