McMahon & Mann Consulting Engineering and Geology, P.C.

Clear Lake Dam

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Clear Lake Dam
Project Details
Location: Collins, New York
Client: Bergmann Associates for The New York State Office of General Services
Client Contact: Mr. Joshua Repp, P.E. 716-852-3211

Clear Lake Dam is located on the North Branch of Clear Creek in the Town of North Collins, Erie County, New York. The dam was constructed in the 1920’s and a water filtration facility was added in the 1950’s. The earthen embankment dam is approximately 30 to 40 feet high by 650 feet long with a concrete spillway. The New York State Office of General Services (OGS) has been overseeing the inspection and assessment of the dam for New York State Department of Corrections and Community Supervision. McMahon & Mann Consulting Engineers, P.C. (MMCE) was retained to provide geotechnical engineering services for the project.

We developed a subsurface exploration program to evaluate the conditions of the earthen embankment. Seven borings were advanced along the crest and toe of the embankment. Groundwater monitoring wells were installed in each of the borings to collect groundwater elevations for use in the stability analysis. We completed rising and falling head tests and packer tests to estimate the permeability of the embankment soils and underlying rock.

The data collected during the subsurface explorations was used to complete an assessment of the earthen embankment slope. The assessment included developing a model of the subsurface soil, rock, and groundwater conditions, completing calculations to estimate the factor of safety for various conditions, comparing the results with the criteria outlined in the New York State Guidelines for Design of Dams and providing recommendations to bring the dam into compliance.

We are currently completing design plans showing the necessary modifications to the upstream and downstream embankment slope. The design is scheduled for completion in the early spring of 2016 and construction is expected to commence in the summer/fall of 2016. 





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