Which preposition to use with schuylkill

at Occurrences 3%

A violent storm ruined the ammunition of both armies and prevented a battle, and the Americans retreated across the Schuylkill at a point farther up the stream.

to Occurrences 2%

Thus, the Reading Railroad, from Philadelphia up the Schuylkill to Reading, and thence to Pottsville, is employed entirely in the transport of coal from the Lehigh coal-fields to tide-water in Philadelphia; and it is a very economically operated road, considering the large amount of ascent encountered, because the load goes down hill, and the weight of the train is limited only by the number of empty cars that the engine can take back.

for Occurrences 1%

Neb, who had passed on board the Schuylkill for a free black, brought me his wages, and when we had thrown our joint stock into a common bag, it was found to amount to the sum of one hundred and thirty-two dollars.

Which preposition to use with  schuylkill