Ohio History Journal

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A HISTORY OF FLOOD CONTROL IN OHIO

A HISTORY OF FLOOD CONTROL IN OHIO

 

 

BY ARTHUR E. MORGAN AND C. A. BOCK

The great ice cap, which covered northeastern North

America during the Glacial period, is estimated to have

been about two miles thick in the region north-east of

the Great Lakes. The weight of this great mass caused

it to creep gradually toward the ocean on the east and

toward the south, where the pressure was less.

In this relentless advance it ground off the hill tops

and filled up the valleys, changing the region south of

the Great Lakes from one of hills and valleys to a broad

plain. The ice sheet came to an end some distance north

of the Ohio River, and from its margin southward the

hills remained undisturbed. The hilly country around

Cincinnati furnishes a picture of what much of the State

would be like, but for the glaciers.

The moving mass of ice, with its burden of boulders,

gravel and powdered rock, wiped out old river valleys,

changed the courses of streams, and quite remade the

surface geography of Ohio. Some of the old river val-

leys, as the Miami River north and south of Dayton, and

the Mad River east of Dayton, were filled in with this

glacial debris to a depth of more than two hundred feet.

In some parts a new surface soil was left, composed

of this ground-up rock, known as glacial till. On other

great areas the limestone rock was left bare. As the

years passed, the lime was leached out by the rains, and

the remaining impurities of the limestone were left be-

hind to form the fertile residual soils of central Ohio.

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