The Allegheny River is a 325-mile-long (523 km) headwater stream of the Ohio River that is located in western Pennsylvania and New York in the United States. It runs from its headwaters just below the middle of Pennsylvania's northern border, northwesterly into New York, then in a zigzag southwesterly across the border and through Western Pennsylvania to join the Monongahela River at the Forks of the Ohio at Point State Park in Downtown Pittsburgh, Pennsylvania.
The Allegheny River with Freeport, Pennsylvania in the background
Much of the Allegheny River's course is through hilly woodlands.
The Highland Park Bridge crosses the Allegheny River at Aspinwall, Pennsylvania, just above Allegheny River Lock and Dam No. 2.
The headwaters of the Allegheny River are in this meadow in Potter County
The Ohio River is a 981-mile-long (1,579 km) river in the United States. It is located at the boundary of the Midwestern and Southern United States, flowing in a southwesterly direction from western Pennsylvania to its mouth on the Mississippi River at the southern tip of Illinois. It is the third largest river by discharge volume in the United States and the largest tributary by volume of the north-south flowing Mississippi River, which divides the eastern from western United States. It is also the 6th oldest river on the North American continent. The river flows through or along the border of six states, and its drainage basin includes parts of 14 states. Through its largest tributary, the Tennessee River, the basin includes several states of the southeastern U.S. It is the source of drinking water for five million people.
The widest point on the Ohio River is just north of downtown Louisville, where it is one mile (1.6 km) wide. Indiana is on the right towards the flood gates, Kentucky on the left, towards the locks. The jetty on the left is the entrance to the Louisville and Portland Canal.
Steamboat Morning Star, a Louisville and Evansville mail packet, in 1858
Built between 1847 and 1849, the Wheeling Suspension Bridge was the first bridge across the river and a crucial part of the National Road.
Cave-in-rock, view on the Ohio (circa 1832, Cave-In-Rock, Illinois): aquatint by Karl Bodmer from the book Maximilian, Prince of Wied's Travels in the Interior of North America, during the years 1832–1834