 Lycoming County is about 130 miles ( <unk> km ) northwest of Philadelphia and 165 miles ( 266 km ) east @-@ northeast of Pittsburgh . Although Plunketts Creek is 6 @.@ 2 miles ( 10 @.@ 0 km ) long , the direct distance between the source and the mouth is only 4 @.@ 1 miles ( 6 @.@ 6 km ) . From the mouth of Plunketts Creek it is 19 @.@ 50 miles ( 31 @.@ 38 km2 ) along Loyalsock Creek to its confluence with the West Branch Susquehanna River at Montoursville . The elevation at the source is 1440 feet ( 439 m ) , while the mouth is at an elevation of 725 feet ( 221 m ) . The difference in elevation , 715 feet ( 218 m ) , divided by the length of the creek of 6 @.@ 2 miles ( 10 @.@ 0 km ) gives the average drop in elevation per unit length of creek or relief ratio of 115 @.@ 3 feet / mile ( 21 @.@ 8 m / km ) . For comparison , the relief ratio of Wallis Run ( the next watershed to the southwest ) is 110 @.@ 9 feet / mile ( 21 @.@ 0 m / km ) , while Loyalsock Creek 's is only 28 @.@ 0 feet / mile ( 5 @.@ 33 m / km ) . 
