About this Project

The General Edgar Jadwin Dam is a dry dam located on Dyberry Creek in Wayne County, Pennsylvania, approximately three miles upstream of Honesdale. Constructed in 1959 by the U.S. Army Corps of Engineers, the dam has prevented millions of dollars in flood damage and plays a critical role in regional flood risk management. It provides up to 24,500 acre-feet of storage to the spillway crest and controls 64.5 square miles of watershed. Unlike traditional reservoirs, Jadwin maintains no permanent pool of water, making it uniquely suited for flood control operations.

In 2023, a geosynthetic liner system was installed on part of the upstream slope and crest of the dam as part of a Dam Safety Modification project. The liner system comprises a geomembrane, geotextile, geogrid, and coarse aggregates, designed to reduce seepage and enhance the long-term stability of the dam. The project also involved excavation and replacement of existing riprap, installation of new riprap, and the addition of piezometers to monitor subsurface water movement.

AEG supported this effort with a range of surveying and geotechnical services. Our team conducted a final existing conditions survey using a combination of scanning, GPS, and conventional methods to capture topography across disturbed areas. Nearing project completion, AEG provided detailed survey data for piezometer wells and USGS concrete slab locations, including northing, easting, and elevation data for multiple well points. This included inner top-of-casing and stick-up elevations to support accurate monitoring and documentation.

AEG’s contributions helped ensure the successful implementation of this critical infrastructure upgrade, enhancing the dam’s performance and resilience for decades to come.