Question: Where is the river crossed by George D. Stuart Bridge located on a map?

full_context: Document 1: List of crossings of the Monongahela River: This is a complete list of current bridges and other crossings of the Monongahela River starting from Pittsburgh, Pennsylvania, where the river helps to form the headwaters of the Ohio River, and ending in Fairmont, West Virginia, where the West Fork River and Tygart Valley River combine to form the Monongahela.
Document 2: Fort Duquesne Bridge: The Fort Duquesne Bridge is a steel bowstring arch bridge that spans the Allegheny River in Pittsburgh, Pennsylvania. It was colloquially referred to as "The Bridge to Nowhere". It was constructed from 1958-1963 by PennDOT, and opened for traffic October 17, 1969 with its predecessor Manchester Bridge (located closer to the tip of Point State Park) closing that same day (it was demolished in the autumn of 1970). The bridge was given the name "The Bridge to Nowhere" because the main span was finished in 1963, but due to delays in acquiring right of ways for the northern approach ramps, it did not connect on the north side of the Allegheny River. The total cost was budgeted at $5 million in 1962. The lack of approach ramps meant the bridge ended in midair, rendering it useless. The northwestern ramps were completed in 1969, allowing access to Pennsylvania Route 65. The northeastern ramps were completed in 1986, with the construction of the northern section of Interstate 279 (North Shore Expressway) which runs through Downtown Pittsburgh's Golden Triangle and north towards Interstate 79.
Document 3: French Creek (Allegheny River tributary): French Creek (also known as the Venango River) is a tributary of the Allegheny River in northwestern Pennsylvania and western New York in the United States.
Document 4: George D. Stuart Bridge: The George D. Stuart Bridge (commonly known as the Tarentum Bridge) is a steel deck truss bridge that carries vehicular traffic across the Allegheny River between New Kensington and Tarentum in the U.S. state of Pennsylvania.
Document 5: Allegheny River: The Allegheny River (/ ˌæləˈɡeɪni / AL - ə - GAY - nee) is a principal tributary of the Ohio River; it is located in the Eastern United States. The Allegheny River joins with the Monongahela River to form the Ohio River at the ``Point ''of Point State Park in Downtown Pittsburgh, Pennsylvania. The Allegheny River is, by volume, the main headstream of the Ohio River.
Document 6: Parker Bridge: Parker Bridge is a truss bridge in the city of Parker, Pennsylvania in the United States. The bridge, constructed in 1934, carries motor vehicles and pedestrians over the Allegheny River.
Document 7: Cowanshannock Creek: Cowanshannock Creek (the eastern section is sometimes referred to as the North Branch Cowanshannock Creek) is a tributary of the Allegheny River in Armstrong and Indiana counties, Pennsylvania in the United States.
Document 8: Pucketa Creek: Pucketa Creek is a tributary of the Allegheny River located in both Allegheny and Westmoreland counties in the U.S. state of Pennsylvania.
Document 9: Emlenton Bridge: The Emlenton Bridge is a steel-deck truss bridge that spans the Allegheny River just south of the town of Emlenton, Pennsylvania, United States at approximately mile marker 44.4 on I-80. With a height of above the river, the Emlenton Bridge was the highest bridge in the Interstate Highway System when completed in 1968 (The Lewiston-Queenston Bridge is higher but is technically an international bridge, not part of the Interstate Highway system). This record was held until 1971 with the opening of the Fred G. Redmon Bridge near Selah, Washington.
Document 10: Deer Creek (Allegheny River tributary): Deer Creek is a tributary of the Allegheny River located in both Allegheny and Butler counties in the U.S. state of Pennsylvania.
Document 11: Tionesta Bridge: The Tionesta Bridge is a girder bridge that carries U.S. Route 62 and Pennsylvania Route 36 across the Allegheny River in rural Forest County, Pennsylvania. The borough of Tionesta on the east bank of the river is connected with an unpopulated section of Tionesta Township on the west bank.
Document 12: C.L. Schmitt Bridge: The C.L. Schmitt Bridge (commonly known as the New Kensington Bridge or the Ninth Street Bridge) is a truss bridge that carries vehicular traffic across the Allegheny River between New Kensington and East Deer Township, Pennsylvania in the United States.
Document 13: David McCullough Bridge: The David McCullough Bridge, commonly and historically known as the 16th Street Bridge, is a steel trussed through arch bridge that spans the Allegheny River in Pittsburgh, Pennsylvania.
Document 14: Emlenton Low Level Bridge: The Emlenton Low Level Bridge is a girder bridge that spans the Allegheny River at Emlenton in the U.S state of Pennsylvania. It connects two separate portions of the borough in Venango and Clarion counties. It replaced, an 1883 truss bridge that stood just upstream, which replaced several previous wooden structures; the modern bridge was constructed in 1987. This bridge is dwarfed by its more famous nearby cousin, the 1968 Emlenton Bridge along Interstate 80.
Document 15: Cheat River: The Cheat River is a tributary of the Monongahela River in eastern West Virginia and southwestern Pennsylvania in the United States. Via the Ohio River, the Cheat and Monongahela are part of the Mississippi River watershed. Owing to the ruggedness of the surrounding Allegheny Mountains, the Cheat remains largely remote with few settlements or developments along its banks. Its headwaters are in the Cheat-Potomac Ranger District of the Monongahela National Forest.
ground_truth: Eastern United States
sub_queries: George D. Stuart Bridge >> crosses Answer: Allegheny River
where is Allegheny River located on a map Answer: Eastern United States