Topography
 

Discussion from McGrain and Currens (1978)

Logan County is in the Mississippian Plateaus area of southwestern Kentucky. The terrain ranges from gently rolling to hilly, and the county can be divided topographically into two broad areas.

The southern half of the county is a karst (sinkhole) plain with elevations between 600 and 650 feet. Streams, where present, are incised approximately 50 to 75 feet below the surface. The northern half of the county contains higher elevations and more rugged topography. The two areas are separated by the Dripping Springs Escarpment, a south-facing cuesta, which rises 150 feet above the karst plain to an elevation of about 750 feet.

The highest elevations in the county are found in a line of isolated hills and knobs situated just south of U.S. 68 between Auburn and Russellville. These are erosion remnants from the Dripping Springs Escarpment, and many attain elevations in excess of 800 feet. The highest of this group, and the highest point in the county, is a knob about 3 1/2 miles southeast of Russellville with an elevation of 868 feet. There are also some high knobs in the northern part of the county near Beechland. Tan Knob, southeast of Beechland, has an elevation of 762 feet; Iron Mountain, southwest of Beechland, is 720 feet.

By contrast, the lowest elevation in Logan County is approximately 395 feet, at the point where Mud River leaves the county. Mud River, which drains the northwestern part of the county, is a slow-flowing, sluggish stream with a low gradient. The elevation of Lake Malone, in the northwestern corner of the county, is 450 feet.

The elevation of Russellville, the county seat, is 595 feet. Elevations at other communities are Adairville, 600 feet; Anderson, 637 feet; Auburn, 642 feet; Epleys, 680 feet; Homer, 525 feet;
Keysburg, 561 feet; Lewisburg, 483 feet; Olmstead, 590 feet; South Union, 608 feet; and Spa, 490 feet.

The 7.5-minute topographic quadrangle maps that cover the county are shown, by name and by index code (Kentucky Natural Resources and Environmental Protection Cabinet) on the index map.

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