In 2014, New York State Parks, Recreation and Historic Preservation called upon Erdman Anthony to provide schematic design, design development, and construction-document preparation to address stream erosion, a sliding embankment causing a noticeable settlement in the roadway grade, and a deteriorating culvert in Letchworth State Park in Castile, NY.
The design, which was permitted by the State Department of Environmental Conservation and the U.S. Army Corps of Engineers, restored an open stream channel by filling and raising the stream in that area of the park. At the downstream end of the restoration and immediately upstream of Park Road, a series of drop structures constructed from grouted rip-rap now serve as a man-made waterfall to dissipate erosive water flow.
Other stream-restoration measures included log revetments, live stakings, tree plantings, installation of fiber rolls on steep slopes, and grading to create vernal pools in the restored stream's newly established floodplain area.
Park Road’s restoration work included 400± feet of full-depth reconstruction through the area of subsidence, an additional 1,000± feet of roadway repair and rehabilitation, a new guide rail, and installation of transverse and longitudinal underdrains to intercept and convey subsurface water in a controlled manner.
Our team also prepared a comprehensive Stormwater Pollution Prevention Plan (SWPPP) to address erosion and sediment control during the project’s construction.