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

Eaton Dam

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Eaton Dam
Project Details
Location: Madison County, New York
Client: Bergmann Associates for the NYS Canal Corp.
Client Contact: Mr. Ken Avery, P.E. (585) 232-5137

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The Eaton Reservoir Dam is owned by the State of New York under the jurisdiction of the New York
State Canal Corporation (NYSCC). Eaton Brook Reservoir Dam is located at the east end of the
Eaton Reservoir near the Town of West Eaton, NY. This dam has been classified by the NYSDEC
as a large, Class C, high hazard dam. Bergmann Associates and McMahon & Mann teamed to complete a
dam safety inspection and engineering assessment for the dam in 2012, as required by NYCRR
Part 673.16.

Eaton Brook Reservoir Dam was completed in 1836. The original Dam was constructed without a
waste weir (spillway), the flow being regulated by sluice gates on 3 iron pipes. In 1991, a new
reinforced concrete spillway was constructed over the center portion of the embankment. Additional
toe drains, drainage stone, and ditches were installed during the construction of the concrete

McMahon & Mann completed subsurface explorations and laboratory and field tests to measure the properties
of the foundation soil and the groundwater levels in the embankment. The subsurface work
included installing standpipe piezometers in the embankment soils to allow measurements of the
groundwater level in the dam fill at various times of the year. The information obtained from the
geotechnical investigation provided the data used to evaluate the seepage conditions and complete
the stability analyses of the embankment.

McMahon & Mann and Bergmann prepared an Engineering Assessment Report that included the results of the
safety inspection, the hydrologic and hydraulic analyses, the stability and seepage analyses and
identified deficiencies in the dam. The report presented conceptual recommendations for
remediation to bring the dam into compliance with current NYSDEC Guidelines.

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