TWT was awarded the Blue Anchor Dam project in order to bring the substandard Route 30 (White Horse Pike) dam into compliance with NJDEP Dam Safety Regulations. The work was begun in early October of 2010, and construction started in 2015.
The Project involves the proposed construction of a new three-staged, semi-circular, ogee-shaped concrete spillway to replace the existing spillway, as well as to replace the currently undersized discharge culvert through the dam. To accelerate bridge construction, a precast concrete rigid frame structure was utilized. The dam crest elevation will be raised by three feet, and the design will also include a sluice gate for the low-level release of water.
The two biggest challenges will be to replace the spillway and discharge structure while maintaining the creek flow through the project site, all while maintaining two-way traffic during the busy summer months. Construction will be accomplished in two phases to meet this goal.
In order to accommodate an additional 12 feet of roadway widening, the spillway will also be relocated. Super-elevation (the banking of roadway on a curve) and 8-foot wide shoulders will be provided for, as well as stormwater management improvements that will address the increase in pavement surface.
TWT performed H&H analysis, inundation/dam break analysis, and all the necessary land surveying services on the project which included horizontal and vertical control, right-of-way delineation, field locations of structures, field topography and stream sections.