Editing Allegheny River (section)

==Hydrography==
{{Further|Geography of Pennsylvania}}
[[File:Headwater Stream (1).jpg|thumb|right|The headwaters of the Allegheny River are in this meadow in [[Potter County, Pennsylvania|Potter County]]]]
[[File:Alleghenyrivermap.png|thumb|right|The Allegheny River [[drainage basin]] covers parts of [[New York (state)|New York]] and [[Pennsylvania]] in the United States.]]
The [[river]] is approximately {{cvt|325|mi}} long, running through the [[U.S. state]]s of [[New York (state)|New York]] and [[Pennsylvania]].<ref name="GNIS1">{{Cite gnis |id=1209386 |name=Allegheny River |access-date=May 13, 2010}}</ref> It drains a rural [[dissected plateau]] of {{cvt|11580|sqmi|km2}} in the northern [[Allegheny Plateau]], providing the northeasternmost drainage in the watershed of the Mississippi River. Its tributaries reach to within {{cvt|8|mi}} of [[Lake Erie]] in southwestern New York.

Water from the Allegheny River eventually flows into the [[Gulf of Mexico]] via the Ohio and [[Mississippi River|Mississippi]] rivers.

The Allegheny Valley has been one of the most productive areas of [[fossil fuel]] extraction in United States history, with its extensive deposits of [[coal]], [[petroleum]], and [[natural gas]].

===Tributaries===
{{Main|Tributaries of the Allegheny River}}
In its upper reaches, the Allegheny River is joined from the south by [[Potato Creek (Pennsylvania)|Potato Creek]] {{cvt|1.7|mi|km}} downstream of [[Coryville, Pennsylvania|Coryville]], Pennsylvania and from the north by [[Olean Creek]] at Olean, New York. [[Tunungwant Creek|Tunungwant "Tuna" Creek]] joins the river from the south in Carrollton, New York (flowing north from Bradford, Pennsylvania); the [[Great Valley Creek]] and [[Little Valley Creek (Allegheny River)|Little Valley Creek]] join the river from the north at Salamanca, New York before becoming the [[Allegheny Reservoir]].

After re-entering Pennsylvania, the river is joined from the east by [[Kinzua Creek]] {{cvt|10|mi|km}} upstream of Warren; from the north by [[Conewango Creek]] at Warren; from the west by [[Brokenstraw Creek]]; from the east by East Hickory Creek at East Hickory; from the east by [[Tionesta Creek]] at Tionesta; from the north by [[Oil Creek (Allegheny River)|Oil Creek]] at Oil City; from the west by [[French Creek (Allegheny River)|French Creek]] at Franklin; from the east by the [[Clarion River]], a principal tributary, at Parker; from the east by [[Crooked Creek (Allegheny River)|Crooked Creek]] southeast of Kittanning; and from the east by the [[Kiskiminetas River]], another principal tributary, at Schenley.

[[Buffalo Creek (Allegheny River)|Buffalo Creek]] enters at Freeport, [[Chartiers Run (Allegheny River)|Chartiers Run]] enters at Lower Burrell, [[Bull Creek (Allegheny River)|Bull Creek]] enters at Tarentum, [[Pucketa Creek]] enters near New Kensington, [[Riddle Run]] enters at Springdale, and [[Girtys Run]] enters at Millvale. And finally, the confluence of the [[Monongahela River]] and Allegheny form the [[Ohio River]] at downtown Pittsburgh. Many additional [[stream]]s enter or join with the Allegheny River along its course.

===Locks, dams and bridges===
{{further|List of crossings of the Allegheny River}}
[[File:Allegheny Islands State Park, C.W. Bill Young Lock and Dam.jpg|thumb|The eastern part of [[Allegheny Islands State Park]] and the [[C. W. Bill Young Lock and Dam]] (No. 3) on the Allegheny River]]

Several locks were built in the early 20th century to make the Allegheny River navigable for 72 miles upstream from Pittsburgh to [[East Brady, Pennsylvania|East Brady]].

The Allegheny River has eight [[Lock (water navigation)|locks]] and [[fixed-crest dam]]s<ref>{{Cite web |url=http://www.fishandboat.com/Zone1/Documents/fixedCrestDams.pdf |title=Know the Rivers! |website=fishandboat.com |quote=All dams on the Allegheny River are Fixed Crest}}</ref> numbered two through nine: Allegheny River Lock and Dam No. [[Allegheny River Lock and Dam No. 2|2]], [[Allegheny River Lock and Dam No. 3|3]], [[Allegheny River Lock and Dam No. 4|4]], [[Allegheny River Lock and Dam No. 5|5]], [[Allegheny River Lock and Dam No. 6|6]], [[Allegheny River Lock and Dam No. 7|7]], [[Allegheny River Lock and Dam No. 8|8]], [[Allegheny River Lock and Dam No. 9|9]] which form corresponding reservoirs.

The river is also impounded by the [[Kinzua Dam]] in northwestern Pennsylvania, resulting in the [[Allegheny Reservoir]] also known as Kinzua Lake and Lake Perfidy among the Seneca. The [[Seneca Pumped Storage Generating Station]] is associated with Kinzua Dam.

Numerous bridges and tunnels span the river throughout its course. The [[Allegheny River Tunnel]], utilized by [[Pittsburgh Light Rail]], went into service in 2012.