Kentucky River Basin Asessment Report

Clarks Run

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OVERVIEW

Geography. The Clarks Run watershed is in southeastern Boyle County. The land is in the inner subregion of the Bluegrass physiographic region, characterized by undulating terrain and moderate rates of both surface runoff and groundwater drainage. The watershed lies partly above fractured shales through which groundwater can easily move but which stores very little water. Other parts lie over interbedded clay shales and siltstones. There are also areas of interbedded shales and limestones (these are 20% limestone; water conduction is poor because of the clay content of the shale) and areas of interbedded limestones and shales (>20% limestone, allowing groundwater flow where the clay content is low enough).

Waterways. Clarks Run empties into the Dix River east of Danville, near Little Needmore. Among the creeks that feed it is Balls Branch.

Land and water use. Land in the watershed is more than 80% agricultural. It includes the southern half of Danville, and therefore is about 8% residential, and about 8% commercial or industrial. Five businesses and organizations hold permits for discharges into the creeks. See tables for details.

Agency data assessment. Three assessed segments of Clarks Run include one that does not support its designated uses, based on biological and/or water-quality data. One fully supports its uses, and one only partially supports its uses. Organic enrichment from municipal point sources, urban runoff, and storm sewers contribute to the impairment of these streams. Pesticides from urban runoff also contribute in the nonsupporting segment. See tables for details.

Watershed rankings. The ranking formula provides a preliminary ranking by synthesizing a broad spectrum of watershed characteristics, current conditions, and threats. This watershed ranks in the group with the lowest need for protection and/or restoration. This rating is for the watershed on average: particular sites and particular waters within the watershed may vary widely. See tables for details.

Volunteer data. Data show high levels of bacteria indicative of fecal contamination in Clarks Run (above 200 colonies/ml). A significant amount of the triazine herbicide atrazine was detected (>1 microgram per liter); however, the concentration of atrazine was well below the EPA’s maximum contaminant level of 3 micrograms per liter. See tables for details.

TABLES

Click here to view tables for this watershed, in PDF format. These tables include land-use characteristics, designated uses, stream assessments, public water supply and water withdrawal sites, permitted discharge sites, gaging and sampling sites, volunteer data, and values for the 35 indicators used in calculating watershed rankings. (You need Adobe Acrobat Reader to view the tables: Adobe Systems will let you download a free copy.)

MAPS                    [You may click the maps below to view them close up.]

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