known tributary pennsylvania united_states approximately miles long flows watershed stream area square miles km2 main rock formation watershed formation number bridges cross stream state roads virtually township roads watershed dirt roads gravel roads stream crossings watershed settlers arrived watershed roads area constructed years later industrial activities logging common watershed early 20th century currently virtually activity wild trout naturally reproduce stream entire length creek substantial course begins central near watershed flows southeast receives tributary stream turns south flows valley passing valley gets deeper stream receives small tributaries turns southwest shortly downstream mouth run southern reaches township stream receives tributary turns south southeast exiting leaving township potter county fork enters continues south passing stream continues south distance crosses pennsylvania route immediately crossing pennsylvania route stream reaches confluence joins miles upstream mouth concentration ranges cubic foot particles stream include coarse sand fine gravel stream experiences relatively high water temperatures july temperature run ranges temperature ranged sediment load pounds acre year nitrogen load pounds acre year load half pound acre year mouth mouth run waters type type stream upper stretch stream type stream middle stretch type stream lower type stream geography geology elevation near mouth feet sea level elevation stream source feet sea level formation main rock formation watershed highlands northwest fork watershed range feet feet highest elevation watershed feet sea level elevation range watershed feet mouth stream feet wide average basin slope degrees numerous gravel bars lower reaches stream width maintained deposition area removed lower reaches stream splits ways feet spot near mouth location watershed flows bedrock large stretch mouth miles downstream stream flows central valley tributary patch erosion feet high feet long mouth bridges cross near mouth carries pennsylvania route carries avenue watershed watershed area square miles km2 making second largest sub watershed miles streams watershed mouth stream united_states geological survey source stream passes number camps residences left bank miles upstream mouth number dirt roads gravel roads edge upper reaches stream watershed state routes township roads watershed upper watershed accessed foot road crossings stream tributaries agricultural land stream history recreation august named settled mouth settling east bank stream stewart settling west bank settlers come far upstream watershed additionally constructed west bank stream roads watershed later 1800s operated gang mill stream settlement called created stream started village called middle reaches intended purpose supply point logging camps area network railroads watershed logging large industry watershed early 1900s industrial activities area old railroad grade located fish stocked stream 1930s 1940s span steel multi beam bridge carrying built repaired bridge feet long span bridge built stream repaired bridge feet long carries pennsylvania route camp built near trail passes mouth biology wild trout naturally reproduce downstream mouth great blue observed despite fact commonly found large river valleys little yellow inhabit brown trout appeared stream 1920s stocked 1940s brown trout populations significantly increased natural area located stream flows natural area acre area includes acre area old growth trees wild area located watershed stream watershed watershed exceptional value area mouth miles upstream mouth canopy cover ranges percent creek significant canopy coverage section percent average lower section percent canopy coverage upper stretch stream canopy coverage percent middle section coverage percent lowest canopy coverage percent tree coverage confluence percent canopy coverage miles downstream confluence averages percent tree species stretch include red maple river birch willow
Hammersley Fork