2'38 -' Ohio State Academy of Science 



been reached by the rising water, the whole of Cedar Point may 

 share the fate of Peninsula Point at no distant date unless 

 jetties, piers, cribwork, etc., suffice to save it. 



The bay with the connected marshes is probably twenty 

 per cent larger now than in 1820. So far as the enlargement is 

 due to erosion it should proceed more rapidly the wider the bay 

 becomes, for the waves attain greater force. The effect of the 

 waves, however, is diminished by the bay bridge, by jetties at 

 the entrance to the bay, by docks and by stones put on the shore 

 purposely to protect the land. The enlargement of the bay due 

 to the subsidence of the land may be partly prevented by dikes 

 and may be effected to some extent by changes at Niagara Falls 

 produced by human agency. We may reasonably expect, how- 

 ever, that the bay will continue to spread over the adjacent low- 

 land much as it has been doing for centuries past. 



The rise of the water due to tilting of the land, 2.14 feet in 

 a century, is about the same as the change of lake level that some- 

 times occurs within a year in consequence of variations in the 

 rainfall and is considerably less than that produced in Sandusky 

 Bay by a single northeast gale. It is, however, cumulative. The 

 present generation is likely to see the water higher than it was in 

 1858 and in northeast gales the lower parts of Sandusky sub- 

 merged, but at the present rate of subsidence the bay at ordinary 

 stages of the water will not extend up Columbus Avenue as far 

 as Market Street for about eight hundred years. Port Clinton 

 is not so fortunately situated. Northeast gales will cause much 

 trouble there as soon as there comes a period of several years 

 when the rainfall is considerably above normal, and before the 

 middle of the next century the water at such times will go quite 

 across the peninsula from Port Clinton to Sandusky Bay. After 

 two or two and a half centuries the water will cover this part of 

 the peninsula for months at a time and after three centuries will 

 do so at ordinary stages. Marblehead will then be an island and 

 Sandusky Bay will show no resemblance to its present form. 



