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Abstract

Spruce Run Dam is located near Clinton, Hunterdon County, New Jersey, on Spruce Run, a tributary of South Branch, Raritan River. The dam will retain and supply excess flow for the off-river storage reservoir at Round Valley near Lebanon, New Jersey. The system, constructed by the State of New Jersey, will provide raw water for sale to cities within the State. The dam is earth fill with a select impervious core of weathered glacial drift. Random sections are of weathered shale; riprap is limestone from spillway excavation. The length of the dam, not including the overflow sections and two short dikes is 5400 feet and the height above natural flood plain averages 85 feet. Bedrock is primarily highly faulted, brecciated Kittatinny Limestone bounded on the northeast by older Hardyston Quartzite and on the west by younger Martinsburg Shale. A grout curtain was constructed which spans the limestone belt except for two short stretches where natural water table stands high. The cutoff trench features a concrete grout cap. The upper rock zone beneath much of the fill was blanket-grouted to minimize ground-water movement and sink-hole development. Actual grout quantities were less than estimated. Major construction was completed in 1963.

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