Alder Brook (West Branch French Creek tributary)

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

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

{{Infobox river

| name = Alder Brook

| name_native =

| name_native_lang =

| name_other = Tributary to West Branch French Creek

| name_etymology =

| image =

| image_caption =

| map =

| map_size = 300

| map_caption =

| pushpin_map = Pennsylvania#USA

| pushpin_map_size = 300

| pushpin_map_caption= Location of Alder Brook mouth

| subdivision_type1 = Country

| subdivision_name1 = United States

| subdivision_type2 = State

| subdivision_name2 = Pennsylvania

| subdivision_type3 = County

| subdivision_name3 = Erie

| subdivision_type4 = Township

| subdivision_name4 = Venango

| subdivision_type5 =

| subdivision_name5 =

| length = {{convert|2.93|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 |accessdate=21 September 2019}}

| width_min =

| width_avg =

| width_max =

| depth_min =

| depth_avg =

| depth_max =

| discharge1_location= West Branch French Creek

| discharge1_min =

| discharge1_avg = {{convert|12.63|cuft/s|m3/s|abbr=on}} at mouth with West Branch French Creek{{cite web |title=Alder Brook Watershed Report |url=https://watersgeo.epa.gov/watershedreport/?comid=9049183 |website=Waters Geoviewer |publisher=US EPA |accessdate=21 September 2019}}

| discharge1_max =

| source1 = divide between Alder Brook and LeBeouf Creek

| source1_location = about 2 miles east of Bogus Corners, Pennsylvania

| source1_coordinates= {{coord|42|03|58|N|079|53|46|W|display=inline}}{{cite web |title=GNIS Detail - Alder Brook |url=https://geonames.usgs.gov/apex/f?p=138:3:0::NO:3:P3_FID,P3_TITLE:1168128,Alder%20Brook |website=geonames.usgs.gov |publisher=US Geological Survey |accessdate=21 September 2019}}

| source1_elevation = {{convert|1,335|ft|abbr=on}}{{cite web |title=West Branch French Creek Topo Map, Erie County PA (Union City Area) |url=https://www.topozone.com/pennsylvania/erie-pa/stream/west-branch-french-creek-2/ |website=TopoZone |publisher=Locality, LLC |accessdate=21 September 2019 |language=en}}

| mouth = West Branch French Creek

| mouth_location = about 3 miles NNW of Lowville, Pennsylvania

| mouth_coordinates = {{coord|42|03|27|N|079|50|30|W|display=inline,title}}

| mouth_elevation = {{convert|1,299|ft|abbr=on}}

| progression = West Branch French Creek → French Creek → Allegheny River → Ohio River → Mississippi River → Gulf of Mexico

| river_system = Allegheny River

| basin_size = {{convert|6.63|sqmi}}

| basin_population =

| tributaries_left = unnamed tributaries

| tributaries_right = unnamed tributaries

| bridges = Wattsburg Road, Phillipsville Road

| custom_label =

| custom_data =

| extra =

}}

Alder Brook is a {{convert|2.93|mi|km|abbr=on}} long tributary to West Branch French Creek classified as a 1st order stream by the EPA Waters Geoviewer.