Editing Millvale, Pennsylvania (section)

===19th century===
In 1849, [[Herrs Island, Pittsburgh|Herrs Island]] and the adjacent riverfront land of [[Reserve Township, Pennsylvania|Reserve Township]] spanning from its northeastern boundary near Girty's Run downriver to Butcher's Run were incorporated as the Borough of Duquesne, distinct from the [[Duquesne, Pennsylvania|modern city]] of the same name.

In 1857, the [[Pennsylvania Railroad]] purchased the [[Right-of-way (property access)|right of way]] from the [[Pennsylvania Canal|Pennsylvania Canal System]]. A massive influx of immigrants searching for work at the nearby railroad occurred at what is now the 40th Street Bridge resulting in the construction of a passenger rail station.<ref>{{Cite book |last=Schotter |first=H. W. |url=https://archive.org/details/kufocasy/mode/2up |title=The Growth And Development Of The Pennsylvania Railroad Company 1846-1926 |publisher=Allen, Lane & Scott |year=1927 |location=Philadelphia |language=en |access-date=December 19, 2023}}</ref>

In 1868, Duquesne was partitioned with the downriver portion annexed by [[Allegheny, Pennsylvania|Allegheny City]], and the land upriver of the northern end of Herrs Island  joined with adjacent lands to the north and east taken from [[Shaler Township, Pennsylvania|Shaler Township]] to form Millvale. 

On February 13, 1868, Millvale Borough was incorporated from parts of Shaler Township and Duquesne Borough with an initial population of 668. It was named after its industry, milling, and location, a valley.<ref name=":2" /><ref name=":3" /> The borough expanded after the [[American Civil War]] and was connected to Lawrenceville via the Ewalt Covered Bridge and a narrow gauge railroad that would become part of Pittsburgh’s trolley system. At the turn of the century, Millvale annexed the Third Ward from the Shaler Township.<ref name=":4" />