Falls of the Ohio National Wildlife Conservation Area

From Academic Kids

The Falls of the Ohio National Wildlife Conservation Area is a national, bi-state area on the Ohio River near Louisville, Kentucky in the United States, administered by the U.S. Army Corps of Engineers. Federal status was awarded in 1981.

Overview

The area is located at the Falls of the Ohio, which was the only navigational barrier on the river in earlier times. The Falls were a series of rapids formed by the relatively recent erosion of the Ohio River operating on 386 million-year-old Devonian hard limestone rock shelves. Louisville, Kentucky, and the associated Indiana communities—Jeffersonville, Clarksville, and New Albany—all owe their existence as communities to the Falls, as the navigational obstacles the Falls presented meant that late 18th Century and early to late 19th Century river traffic could benefit from local expertise in navigating the 26-foot drop made by the river over a distance of two miles. In its original form, the Falls could be characterized more as rapids extending over a length of the river, than as a pointlike discontinuity in a river such as Niagara Falls. Still, the Falls provided a singular, dramatic and daunting obstacle to navigation on this important inland waterway.

The first locks on the river were built on a bypass canal there to provide year-round navigation on the river. The Falls were then largely covered by the McAlpine Locks and Dam, built by the Army Corps of Engineers. The taming of the Ohio River at the Falls, with the attendant reduction in local flow velocity. has of late led to the covering over of the fossil beds by large and increasing quantities of low-velocity effluvia: although an impediment to viewing of the fossils, this action serves to protect the portions of the Falls covered over by sediment and therefore temporarily immune to direct weathering. However, a significant area of the fossil-rich Devonian limestone rock is still left exposed, and is accessible to visitors today. The best time for visitation is during the low water season of the Ohio River is between August and October. Removal of fossils is prohibited.

Because of the shallowness of the river at the Falls, it was a favorite crossing point for bison in pre-settlement times.

In 1990, a section of the area in Indiana became the Falls of the Ohio State Park. An interpretive visitor center is open throughout the year.

Geology

The rock unit in which the Falls are formed is referred to as the Jeffersonville Limestone. The limestone formed approximately 387 to 380 million years ago during the Emsian Age (in the latest part of the Early Devonian Period) and the Eifelian Age (Middle Devonian).

During the Devonian Period, the region lay at the bottom of a shallow inland sea about ten degrees north of the equator in the supercontinent of Euramerica.

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