West Branch French Creek rises in the Town of Mina, New York in western Chautauqua County and flows southwest into Erie County, Pennsylvania and then turns south towards Wattsburg, Pennsylvania.
Watershed
West Branch French Creek drains 77.89 square miles (201.7 km2) of Erie Drift Plain (glacial geology). The watershed receives an average of 46.8 in/year of precipitation and has a wetness index of 474.55.[4] The watershed is about 44% forested.
Tributaries
Tributaries to West Branch French Creek (French Creek tributary)
Bailey Brook rises on the French Creek divide about 3 miles southeast of Little Hope, Pennsylvania. The brook then flows southwest to meet West Branch French Creek about 0.5 miles north of Lowville, Pennsylvania.
Alder Brook rises on the LeBoeuf Creek divide about 2 miles east of Bogus Corners, Pennsylvania. The brook then flows east to meet West Branch French Creek about 3 miles north-northwest of Lowville, Pennsylvania. Alder Brook is the largest West Branch tributary by watershed area.
Townley Run rises near Greenfield Church on the Sevenmile Creek divide. The run then flows southeast to meet West Branch French Creek about 2 miles southwest of Little Hope, Pennsylvania.
Darrow Brook rises about 4 miles west of French Creek, New York within the Town of Mina. The brook then flows north and northwest entering Erie County, Pennsylvania and meeting West Branch French Creek about 0.25 miles southeast of Ashton Corners, Pennsylvania. Darrow Brook is the largest West Branch tributary by average discharge.