About this Project

The Marquette Lake Dam Rehabilitation project is a critical infrastructure initiative located in Lebanon County, Pennsylvania, serving a facility leased to the Federal Government’s National Guard Bureau. The dam spans approximately 1,180 feet in length and stands 27 feet high. Classified as a high-hazard dam, it requires rigorous design and safety measures to meet Pennsylvania Department of Environmental Protection (PADEP) Chapter 105 Dam Safety regulations and withstand the Probable Maximum Flood (PMF).

AEG served as the Prime Consultant for the Preliminary Design phase, tasked with developing cost-effective renovation strategies for the dam, spillway, and downstream channel. The design included a protection system to armor the dam breast and spillway during overtopping events, ensuring long-term structural integrity and flood resilience.

AEG’s scope of services included:

• Geotechnical Investigation: Evaluated embankment properties and subsurface conditions to support seepage and slope stability analyses. Findings were documented in the Preliminary Geotechnical Engineering Report (PGER).
• Geophysical Investigation: Employed Electrical Resistivity Imaging (ERI) and Spontaneous Potential (SP) methods to assess material variability, saturation, and seepage potential. Results were summarized in the Geophysics Report.
• Environmental & Water Resources: Coordinated with PADEP for permitting, prepared Erosion & Sediment Control (E&SC) and post-construction stormwater management plans, and conducted floodplain assessments and H&H analyses.
• Cost Estimating: Provided comparative cost estimates for rehabilitation options, including partial upgrades and complete dam replacement.

AEG continues to support the project through annual inspections, helping ensure compliance and safety for this high-risk infrastructure.

Photo Courtesy of LebTown.