
The confluence of the Beaver River and the Ohio River anchors this 1901 survey, revealing an industrial landscape defined by river navigation and rail transport. Steep-walled valleys host a dense cluster of river towns, from the established county seat at Beaver to the manufacturing centers of Beaver Falls, Rochester, and Monaca. Significant engineering of the era is evident at Dam No. 5 and Dam No. 6, which regulated the Ohio for heavy barge traffic.
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