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1 September 2007 The Legacy Sediment Record within the Munroe Falls Dam Pool, Cuyahoga River, Summit County, Ohio
John A. Peck, Andrea Mullen, Andrew Moore, Joseph H. Rumschlag
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Dams decrease stream gradient and flow velocity, and often trap a stream's sediment load. For 188 years, sedimentation in the Munroe Falls dam pool on the Cuyahoga River, Ohio created a sediment record of both natural and anthropogenic variability. A wooden dam, first constructed in 1817, was replaced with a 3.66-m-high stone dam in 1902 to better serve local industrial needs. Before this dam was removed in 2005, a coring and transect profiling study was undertaken to characterize the dam pool sediments. To a distance of 600 m upstream of the Munroe Falls Dam, only ~30 cm of sediment overlaid the bedrock in the thalweg, indicating that the deep-water channel was an area of sediment transport. However, in the low-velocity shallow-water margins of the dam pool, up to 3 m of organic-rich, clayey silt had accumulated above pre-dam floodplain deposits. Past flooding events are recorded in these dam pool sediment deposits by an increase in woody debris and sand. A distinctive lithology having an oily sheen, abundant woody debris, and elevated trace metal concentrations occurs at depth throughout the deposits in the shallow-water margins of the dam pool. 210Pb dating places the top of this layer at approximately 1918. The 1913 flood in northeast Ohio probably deposited this contaminated layer from washed-out upstream sources. A direct relationship between sediment trace metal (Pb, Zn) and magnetic mineral concentrations demonstrates that magnetic parameters can provide rapid pollution assessment of dam pool sediments.

John A. Peck, Andrea Mullen, Andrew Moore, and Joseph H. Rumschlag "The Legacy Sediment Record within the Munroe Falls Dam Pool, Cuyahoga River, Summit County, Ohio," Journal of Great Lakes Research 33(sp2), 127-141, (1 September 2007).[127:TLSRWT]2.0.CO;2
Received: 31 October 2006; Accepted: 4 May 2007; Published: 1 September 2007

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contaminated sediment
Cuyahoga River
dam removal
legacy sediment
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