torrential rain fell in July 2003, resulting in such high volume that the river changed its course in Leavittsburg, flooding and destroying nearly 100 homes. For much of the upper half of the river, the land is relatively flat with minimal relief to confine the river. This makes it prone to change courses during high-water events. Around Youngstown, the river valley becomes much more pronounced and the river is more constrained, although there is still room for localized avulsions. See also List of rivers of Ohio List of rivers of Pennsylvania Mahoning Valley References External links Archived version of Youngstown State University's Mahoning River Watershed website Archived version of Mahoning River Consortium website Rivers of Ohio Rivers of Pennsylvania Tributaries of the Beaver River Youngstown, Ohio Rivers of Clearfield County, Pennsylvania Rivers of Lawrence County, Pennsylvania Rivers of Mahoning County, Ohio Rivers of Columbiana County, Ohio Rivers of Stark County, Ohio Rivers of Portage County, Ohio Rivers of Trumbull County, Ohio