Saw Mill Run

{{Short description|Stream in Pennsylvania, USA}}

{{Use American English|date=February 2025}}

{{Infobox river

| name = Saw Mill Run

| name_native =

| name_native_lang =

| name_other = Tributary to Ohio River

| name_etymology =

| image = SeldomSeenArch.jpg

| image_caption = The Seldom Seen Arch, built in 1903, over Saw Mill Run along Saw Mill Run Boulevard not far from Woodruff Street in the Beechview neighborhood of Pittsburgh, Pennsylvania

| image_alt = Seldom Seen Arch

| map =

| map_size = 300

| map_caption =

| pushpin_map = USA Pennsylvania#USA

| pushpin_map_size = 300

| pushpin_map_caption = Location of Saw Mill Run mouth

| pushpin_map_alt = Map of Saw Mill Run mouth location

| subdivision_type1 = Country

| subdivision_name1 = United States

| subdivision_type2 = State

| subdivision_name2 = Pennsylvania

| subdivision_type3 = County

| subdivision_name3 = Allegheny County

| subdivision_type4 = City

| subdivision_name4 = Pittsburgh

| subdivision_type5 = Borough/Township

| subdivision_name5 = Castle Shannon
Mt. Lebanon

| length = {{convert|9.12|mi|km|abbr=on}}{{cite web |title=ArcGIS Web Application |url=https://epa.maps.arcgis.com/apps/webappviewer/index.html?id=ada349b90c26496ea52aab66a092593b |website=epa.maps.arcgis.com |publisher=US EPA |access-date=12 May 2021}}

| width_min =

| width_avg =

| width_max =

| depth_min =

| depth_avg =

| depth_max =

| discharge1_location = Ohio River

| discharge1_min =

| discharge1_avg = {{convert|19.57|cuft/s|m3/s|abbr=on}} at mouth with Ohio River{{cite web |title=Sawmill Run Watershed Report |url=https://watersgeo.epa.gov/watershedreport/?comid=3822821 |website=US EPA Geoviewer |publisher=US EPA |access-date=12 May 2021}}

| discharge1_max =

| source1 = McLaughlin Run divide

| source1_location = Mt. Lebanon, Pennsylvania

| source1_coordinates = {{coord|40|21|14|N|080|02|24|W|display=inline}}{{cite web |title=GNIS Detail - Sawmill Run |url=https://geonames.usgs.gov/apex/f?p=138:3:::NO::P3_FID,P3_TITLE:1187035,Sawmill%20Run |website=geonames.usgs.gov |publisher=US Geological Survey |access-date=12 May 2021}}

| source1_elevation = {{convert|1,250|ft|abbr=on}}{{cite web |title=Get Maps |url=https://ngmdb.usgs.gov/topoview/viewer/#15/40.3539/-80.0400 |website=USGS Topoview |publisher=US Geological Survey |access-date=12 May 2021 |language=en}}

| mouth = Ohio River

| mouth_location = Saw Mill Run Boulevard and Carson Street, Pittsburgh, Pennsylvania

| mouth_coordinates = {{coord|40|26|41|N|080|01|39|W|display=inline,title}}

| mouth_elevation = {{convert|710|ft|abbr=on}}{{cite web |title=Get Maps |url=https://ngmdb.usgs.gov/topoview/viewer/#15/40.4422/-80.0310 |website=USGS Topoview |publisher=US Geological Survey |access-date=12 May 2021 |language=en}}

| progression = northeast then northwest

| river_system = Ohio River

| basin_size = {{convert|19.42|sqmi}}

| basin_population =

| tributaries_left = unnamed tributaries

| tributaries_right = unnamed tributaries

| waterbodies =

| bridges = Santa Fe Drive, Caswell Drive, Milford Drive (x2), Connor Road, Willow Avenue, Canal Street, Castle Shannon Boulevard, Killarney Drive, PA 88, Kingwood Street, PA 51 (x2), Whited Street, PA 51, Fawn Street, Fine Way. PA 51, Edgebrook Avenue, PA 51 (x2), Crane Avenue, I-376, Miniotte Square, Neptune Street, S Main Street, PA 51

| custom_label =

| custom_data =

| extra =

}}

Saw Mill Run is a tributary of the Ohio River in Pennsylvania. It is an urban stream, and lies entirely within Allegheny County, Pennsylvania. The stream enters the Ohio just downstream from the Forks of the Ohio in Pittsburgh, at a place that was founded as the town of Temperanceville in the 1830s. It provides an entry through the elevated plateau south of Pittsburgh known as the South Hills, and land transportation has paralleled the stream since the nineteenth century.

The stream is named for an actual saw mill that operated near the mouth of the stream where it empties into the Ohio River. The first reference to the mill is in relation to the construction of Fort Pitt (1759–1761). The mill provided much of the lumber used in the construction of the new Fort, after the British claimed the area from the French and destroyed Fort Duquesne.{{Cite book|title=Pittsburgh: The story of an American city|last=Lorant|first=Stefan|date=1999|publisher=Esselmont Books|isbn=0967410304|edition=5th|oclc=42704989}}