Pocono Springs Civic Association – Crystal Lake Dam Replacement
Modernizing Crystal Lake Dam to Safely Withstand Design Flood Events
Following a routine dam inspection and hydrologic and hydraulic evaluation, the Crystal Lake Dam in Lehigh Township, Pennsylvania, was identified for replacement. Its spillway was in deteriorated condition and had insufficient capacity to safely pass the design flood without overtopping the adjacent earthen embankments.
The project also provided an opportunity to lengthen the spillway, allowing for removal of a leaning portion of the concrete core wall within the embankment and improving overall structural stability. In addition, the low-level outlet system was reconfigured to enhance accessibility for operation and maintenance.
Full-Service Design
LaBella provided geotechnical, civil, and structural engineering services to develop a new spillway configuration designed to meet current regulatory and safety standards, including the requirements of Pennsylvania Code Chapter 105 for a Class C-2 dam.
The design includes:
- Full replacement of the existing concrete spillway with a new gravity structure founded on soils
- Partial removal and reconstruction of adjacent core walls
- New abutment walls
- Downstream apron with training walls
Improvements also include a new low-level outlet pipe and gate integrated into the abutment structure, as well as a pedestrian bridge spanning the tailwater channel.
Permitting was submitted in October 2025. The project is currently ongoing.
