The North Elkhorn Creek
watershed occupies northern Fayette County, southern Scott County, and part of
western Franklin County. The land is in the Inner Bluegrass physiographic
region, characterized by an undulating terrain and moderate rates of surface
runoff and groundwater drainage. Most of the watershed lies above thick layers
of easily dissolved limestone that form carbonate aquifers. Groundwater flows
through channels in the limestone, so caves and springs are common in regions
with this geology. Some areas lie above interbedded limestones and shales
(>20% limestone, allowing groundwater flow where the clay content is low
enough).
Waterways. The North Elkhorn runs generally northwest from its origin
at the west edge of Fayette County and empties into the Kentucky River just east
of Frankfort. Among the creeks that feed it are David Fork, Goose Creek, Boyd
Run, Miller Run, Lanes Run, Dry Run, McCracken Creek, Blue Spring Branch,
McConnell Run, and Lecomptes Run.
Land and water use. Land in the watershed is primarily agricultural,
despite several densely settled areas. Residential and commercial areas make up
about 10%, and less than 2% is forested. The watershed includes the north side
of Lexington. The surface waters of the watershed supply the drinking water for
the municipal systems in Georgetown and Stamping Ground. Twenty-eight businesses
and organizations hold permits for discharges into the creeks. See tables for
details.
Agency data assessment. The assessed creek segments in this watershed
include six that do not support some or all of their designated uses, based on
biological and/or water-quality data. Two others only partially support their
uses. Agriculture, construction, and sewage from municipal systems and small
package plants contribute to the impairment of these streams via siltation,
pathogens, habitat modification, and nutrient enrichment. 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 highest 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 Cane Run. Cane Run also exhibited elevated levels of several
metals: aluminum, iron, and thallium. Phosphorus levels at all three volunteer
sites were elevated enough to cause potential nutrient enrichment problems (>
0.1 mg/L). See tables for details.