Abstract
Abstract : Shay Lake Dam is a 24 foot high, 475 foot long earthfill, clay core embankment dam built in 1938. The upstream and downstream faces are of earth and rock facing. The upstream face is inclined at 3H:1V and the downstream face is inclined at 2.5H:1V. The dam embankment top width is 12 feet. The 35-foot long free overflow stepped spillway is adjacent to the south abutment. A wooden footbridge supported by two piers spans the spillway. The spillway is of mortared stone masonry and drops in two 24-inch steps. The spillway discharge channel is a paved inclined channel with mortared masonry training walls and is approximately 75 feet long. A 24-inch diameter cast iron low-level outlet pipe passes through the toe of the dam about 160 feet from the south abutment. Shay Lake Dam is 41 years old and in fair overall condition. It is small in size and classified as Low Hazard, a downgrading from its initial classification of High Hazard. The dam embankment shows evidence of sloughing at two locations on the downstream face. Trees and brush are growing on the embankment in an area adjacent to the spillway discharge channel and north abutment. A wet area near the toe of the embankment was observed. The spillway can pass the 100-year discharge and is adequate.
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