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Lake Stockwell Dam

Medford Township, Burlington County, NJ<br style='line-height:2px'>YMCA Ockanickon

Stockwell Dam was originally built for the lumber industry. It had a wooden crib foundation and wooden sluice box, along with a wooden drop box and flash boards. The property on which the dam was located became YMCA Camp Ockanickon about 100 years ago, while the repaired and partially reconstructed dam itself had existed for 75 years. The dam and lake had become the recreational focal point of the community and the summer programs of the YMCA Camp. In addition, the facility generated income that directly supported the camp programs.

In July 2004, 13.4 inches of rain fell over the region, and the resulting flood flows breached many dams, including Stockwell. HAKS designed a replacement that was both functional and affordable.  The New Jersey Department Environmental Protection (NJDEP), after reviewing documentation HAKS submitted, classified Stockwell as a Class II dam, which required a ½ Probable Maximum Flood design. Our analyses indicated that design flow could not be handled through a culvert, which led us to design overtopping protection in the form of articulated concrete matting.

In addition to the dam design, we addressed environmental constraints and permits necessary before construction. Wetlands near the dam had to be protected and a stream encroachment permit for temporary and permanent crossings was needed. HAKS applied for and received all permits. The temporary crossing was built immediately to provide alternate access to the camp for safety purposes.

HAKS was able to bring the structure to construction in less than one year from the dam breach. We inspected the construction and were instrumental in keeping the project on target for both cost and schedule. The $1.3 million project was built without one change order.