 The most damaging Lock Haven flood was caused by the remnants of Hurricane Agnes in 1972 . The storm , just below hurricane strength when it reached the region , made landfall on June 22 near New York City . Agnes merged with a non @-@ tropical low on June 23 , and the combined system affected the northeastern United States until June 25 . The combination produced widespread rains of 6 to 12 inches ( 152 to 305 mm ) with local amounts up to 19 inches ( 483 mm ) in western <unk> County , about 75 miles ( 121 km ) southeast of Lock Haven . At Lock Haven , the river crested on June 23 at 31 @.@ 3 feet ( 9 @.@ 5 m ) , second only to the 1936 crest . The flood greatly damaged the paper mill and Piper Aircraft . 
