General Edgar Jadwin Dam Reservoir Report

Last Updated: December 6, 2025

General Edgar Jadwin Dam, also known as Jadwin Dam, is a rockfill dam located in Honesdale, Pennsylvania, along Dyberry Creek.


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Summary

Completed in 1960 by the US Army Corps of Engineers, the dam stands at a structural height of 110 feet and has a maximum storage capacity of 47,300 acre-feet. The primary purpose of the dam is flood risk reduction, with a spillway width of 164 feet to manage uncontrolled flow during extreme flood events.

Despite being classified as having a high hazard potential due to the possibility of a breach during intense rainfall events, USACE has implemented risk management measures to address the problem soil layer within the dam. A recent Dam Safety Modification Study has led to the design of permanent repairs aimed at reducing the risk associated with the dam. Regular inspections, monitoring, and emergency preparedness measures are in place to ensure the safety of downstream communities, such as Honesdale and Hawley, in the event of a potential flood event.

With a history of reaching problem soil layers during reservoir elevation, the effectiveness of repairs made in 1970 remains uncertain. However, USACE's commitment to ongoing monitoring, data analysis, and emergency exercises with local authorities demonstrates their dedication to mitigating risks associated with General Edgar Jadwin Dam and ensuring the safety of surrounding areas.

Year Completed

1960

Dam Length

1255

River Or Stream

DYBERRY CREEK

Primary Dam Type

Rockfill

Surface Area

1

Hydraulic Height

97

Drainage Area

65

Nid Storage

47300

Structural Height

110

Outlet Gates

Uncontrolled - 0

Hazard Potential

High

Foundations

Rock

Nid Height

110
       
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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.