Broad Run (Loudoun County, Virginia)

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

{{Infobox river

| name = Broad Run

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| image = 2019-07-19 13 00 36 View northeast along Broad Run as it passes between the Loudoun County Parkway and Old Ox Road on the edge of the Dulles section of Sterling, Arcola, Brambleton and Loudoun Valley Estates in Loudoun County, Virginia.jpg

| image_caption = Broad Run passes through an increasingly suburbanized environment in eastern Loudoun County

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| subdivision_type1 = Country

| subdivision_name1 = United States

| subdivision_type2 = State

| subdivision_name2 = Virginia

| subdivision_type3 = Region

| subdivision_name3 = Loudoun County

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| source1 =

| source1_location = Aldie

| source1_coordinates= {{coord|38.9862207|-77.586381|display=inline}}

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| mouth = Potomac River

| mouth_location = Sterling

| mouth_coordinates = {{coord|39.0712187|-77.4438770|display=inline,title}}

| mouth_elevation = {{convert|184|ft|abbr=on}}

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| basin_size_mi2 = 91.3

| tributaries_left = Beaverdam Run

| tributaries_right = Lenah Run, South Fork (Shenandoah River), Cabin Branch (Arcola), Horsepen Run, Cabin Branch (Sterling)

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Broad Run is a tributary of the Potomac River in Loudoun County, Virginia. The creek, located between Goose Creek and Sugarland Run, principally drains portions of eastern Loudoun County, as well as a small portion of western Fairfax County.Loudoun County Government, Leesburg, VA (2006). [http://www.loudoun.gov/Portals/0/docs/Maps/watershedmap.pdf "Loudoun County Watersheds."] {{webarchive |url=https://web.archive.org/web/20100528173052/http://www.loudoun.gov/Portals/0/docs/Maps/watershedmap.pdf |date=May 28, 2010 }} Map.

The headwaters of the creek are located about {{convert|3|mi|km}} northeast of Aldie. The creek flows eastward near Arcola and continues generally northeast to its mouth at the Potomac near the southern end of Seldon's Island to the north of Sterling and about {{convert|10|mi|km}} southeast of Leesburg. The watershed of the creek is 67.5 mi² (175 km²) in Loudoun and 23.8 mi² (62 km²) in Fairfax.Loudoun County Department of Building and Development (2009).[http://www.loudoun.gov/Portals/0/docs/BD/Stream%20Assessment%20Strategic%20Plan.pdf "Loudoun County Stream Assessment: Strategic Plan and Protocols."] {{webarchive |url=https://web.archive.org/web/20100528080605/http://www.loudoun.gov/Portals/0/docs/BD/Stream%20Assessment%20Strategic%20Plan.pdf |date=May 28, 2010 }} 2009-09-25.

The majority of the run forms the border between the unincorporated areas of Ashburn and Sterling. The Broad Run Magisterial District of Loudoun and Broad Run High School derive their names from the waterway. The Broad Run Bridge and Tollhouse is a national listed historic site.

The creek should not be confused with the nearby Broad Run (a tributary of the Occoquan River) that flows through Fauquier and Prince William Counties.{{cite book

|editor1-first=Richard |editor1-last=Edwards |year=1855 |page=[https://archive.org/details/statisticalgaze00projgoog/page/n145 187]

|location=Richmond, Virginia

|title=Statistical Gazetteer of the State of Virginia: Embracing Important Topographical and Historical Information from Recent and Original Sources, Together with the Results of the Last Census Population, in Most Cases, to 1854

|publisher=For the proprietor |access-date=2014-01-02

|url=https://archive.org/details/statisticalgaze00projgoog

|quote=BROAD RUN, of Loudoun county, Virginia, flows northward, and falls into the Potomac about 10 miles S.E. from Leesburg.}}