Mill Creek Watershed (Ohio River Basin)
The Mill Creek watershed is located in southwestern Ohio. Mill Creek flows into the Ohio River in Cincinnati. It drains a total of 169 square miles and flows through all or part of three counties. Major municipalities partially or fully in the watershed include Cincinnati and some of its suburbs, Fairfield, Hamilton and Beckett Ridge.
The watershed is predominantly comprised of urban development with pockets of forest and a small amount of agricultural lands in the northern portion of the watershed. Industry dominates the mid- to lower reaches of the watershed, and commercial and suburban uses are predominant in the upper watershed. The watershed also contains several CSOs and SSOs. Old industrial landfills line the banks of Mill Creek in some areas and several old hazardous waste sites have the potential to influence the stream.
Most of the mainstem and major tributaries have been assigned the Warmwater Habitat aquatic life use designation. Permanent channel modification by U.S. Army Corps of Engineers resulted in assigning Modified Warmwater Habitat to the lower eight miles of Mill Creek. U.S. ACOE, local jurisdictions, and property owners have also done additional stream alterations in much of the watershed. U.S. ACOE is presently reevaluating the flood reduction strategy for Mill Creek.
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