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The Ohio River at Cairo is 281,500 cu ft/s (7,960 m 3 /s); [1] and the Mississippi River at Thebes, Illinois, which is upstream of the confluence, is 208,200 cu ft/s (5,897 m 3 /s). [66] The Ohio River flow is greater than that of the Mississippi River, so hydrologically the Ohio River is the main stream of the river system.
The Point Pleasant Formation is the oldest rock unit exposed at the surface in Ohio and formed during the Late Ordovician, outcropping along the Ohio River near Cincinnati. The formation records a transition from shallow-water limestone reef formation to a deeper water environment, marked by overlying shale and limestone, which form the ...
Cincinnati Arch Formations and Layers. The Cincinnati Arch contains three distinct stages: the Edenain, Maysvillian, and the Richmondian. [3] The Edenian stage is the oldest stage of the three. The Edenian contains these formations: Kope, Clays Ferry, Garrard Siltstone, Catheys, Inman, Fairview, and Leipers Limestone. [3]
This is a list of locks and dams of the Ohio River, which begins at the confluence of the Allegheny and Monongahela rivers at The Point in Pittsburgh, Pennsylvania and ends at the confluence of the Ohio River and the Mississippi River, in Cairo, Illinois. A map and diagram of U.S. Army Corps of Engineers operated locks and dams on the Ohio River.
The highest level ever recorded on the Ohio River in Cincinnati was on Jan. 26, during the devastating flood of 1937. Historic crests on the Ohio River in Cincinnati. 80 feet on Jan. 26, 1937. 71. ...
The Mill Creek is a stream in southwest Ohio. It flows 28.4 miles (45.7 km) [1] southwest and south from its headwaters in Liberty Township of Butler County through central Hamilton County and the heart of Cincinnati into the Ohio River just west of downtown. The section of Interstate 75 through Cincinnati is known as the Mill Creek Expressway.
The Falls, circa 1929. 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.
Pepper, et al., hypothesized that the river flowed first into the Ohio basin before switching course to the Michigan basin, thus the Michigan Berea Sandstone would be slightly younger. [14] There is a downwarp in the Cincinnati arch, called the Ontario sag, that if it was present at the formation of Berea Sandstone, could mean that it formed a ...