description coordinates headwaters headpoint, Pilot Peak 39°47′00″N 120°52′08″W / 39.783213°N 120.868793°W / 39.783213; -120.868793 (Pilot Peak ) 39°46′48″N 120°52′26″W / 39.7798938°N 120.8738388°W / 39.7798938; -120.8738388 South Fork source, SSW of peak road, La Porte South Fork in Little Grass Valley Reservoir inflow, reservoir 39°44′48″N 120°58′09″W / 39.74653°N 120.969172°W / 39.74653; -120.969172 (reservoir ) confluence, Black Rock Creek inflow, diversion from Slate Creek [ 2] : 38 [ specify ] confluence, Tooms Creek dam, Little Grass Valley [ 3] 39°43′30″N 121°01′12″W / 39.725013°N 121.020112°W / 39.725013; -121.020112 South Fork border, Plumas/Butte counties [ specify ] confluence, Post Creek 39°46′48″N 120°52′26″W / 39.7798938°N 120.8738388°W / 39.7798938; -120.8738388 (Post Creek confluence ) dam, South Fork Diversion 63-004 39°38′55″N 121°07′06″W / 39.648658°N 121.118431°W / 39.648658; -121.118431 (South Fork Diversion dam ) confluence, Rock Creek 39°37′13″N 121°08′29″W / 39.620268°N 121.141434°W / 39.620268; -121.141434 (Rock Creek confluence ) confluence, Know-nothing Creek 39°35′07″N 121°10′17″W / 39.585252°N 121.171303°W / 39.585252; -121.171303 (Know-nothing Creek confluence ) confluence, Lost Creek 39°33′50″N 121°11′25″W / 39.563816°N 121.190186°W / 39.563816; -121.190186 (Lost Creek confluence ) dam 39°33′06″N 121°12′36″W / 39.551574°N 121.210055°W / 39.551574; -121.210055 (dam ) confluence, Oroleve Creek 39°32′55″N 121°12′58″W / 39.548563°N 121.215978°W / 39.548563; -121.215978 (Oroleve Creek confluence ) dam 39°32′18″N 121°15′04″W / 39.538453°N 121.25105°W / 39.538453; -121.25105 (dam ) 39°32′55″N 121°16′39″W / 39.54861°N 121.27750°W / 39.54861; -121.27750 Ponderosa Reservoir & Lake Oroville South Arm mouth, South F @ Ponderosa Reservoir dam, Ponderosa Reservoir 39°32′57″N 121°18′13″W / 39.54925°N 121.303482°W / 39.54925; -121.303482 (Ponderosa Reservoir ) road, Ponderosa Way 39°32′58″N 121°18′13″W / 39.549572°N 121.303568°W / 39.549572; -121.303568 (Ponderosa Way crossing ) inflow, L Oroville South Arm 39°33′00″N 121°18′17″W / 39.550126°N 121.304641°W / 39.550126; -121.304641 (Lake Oroville inflow ) confluence, Sucker Run 39°33′00″N 121°18′42″W / 39.549953°N 121.311765°W / 39.549953; -121.311765 (Sucker Run confluence ) road, Lumpkin 39°32′11″N 121°20′23″W / 39.536483°N 121.339746°W / 39.536483; -121.339746 (Lumpkin Road crossing ) channel @ Enterprise Boat Ramp (BR) former town, Enterprise confluence, Powell Creek
39°32′11″N 121°21′51″W / 39.53639°N 121.36417°W / 39.53639; -121.36417 (Enterprise, California ) channel @ Stringtown Car-Top BR 39°33′5″N 121°25′20″W / 39.55139°N 121.42222°W / 39.55139; -121.42222 former Feather River (prior to Lake Oroville) mouth (former), South F w/ Middle F outflow, Lake Oroville East Arm road, Olive Hwy (CA 162) inflow, Lake Oroville Main Basin
39°33′01″N 121°25′48″W / 39.550317°N 121.430082°W / 39.550317; -121.430082 (Lake Oroville East Arm to Main Basin ) former confluence, North F w/ Feather r 39°33′20″N 121°28′0″W / 39.55556°N 121.46667°W / 39.55556; -121.46667 (former confluence with North Fork )