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Consultants recommend in‑lake approach for High Rock Lake dredging; cost estimates range widely
Summary
A Geosyntech study presented Aug. 4 found 1.6–2.8 million cubic yards of sediment in High Rock Lake and recommended an in‑water relocation (Scenario A) as the most cost‑effective option, with a class‑level cost estimate of roughly $15–$57 million; presenters cautioned about permitting hurdles with the U.S. Army Corps of Engineers.
Consultants from Geosyntech told the Rowan County Board of Commissioners on Aug. 4 that High Rock Lake has accumulated roughly 1.6 million to 2.8 million cubic yards of sediment in its upper reaches and recommended an in‑water material relocation—pumping sediment into bermed island areas—as the most cost‑effective path forward.
Geosyntech presented sediment sampling and bathymetric survey results from three study reaches (upper lake, Swearing Creek reach and mid‑channel). The firm reported 22 sampling locations and described material types: sands in the upper reach and finer clay/silt deposits in the Swearing Creek and mid‑channel…
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