 By 1900 , the lumber industry had declined , and the city 's economic base rested on other industries , including a furniture factory , a paper mill , a fire brick plant , and a silk mill . In 1938 , the Piper Aircraft Corporation , maker of the Piper Cub and other light aircraft , moved its production plant to Lock Haven . It remained one of the city 's biggest employers until the 1980s , when , after major flood damage and losses related to Hurricane Agnes in 1972 , it moved to Florida . The loss of Piper Aircraft contributed to an unemployment rate of more than 20 % in Lock Haven in the early 1980s , though the rate had declined to about 9 % by 2000 . Another large plant , the paper mill that had operated since the 1880s in Castanea Township , closed in 2001 . By 2005 , 32 % of the city 's labor force was employed in health care , education , or social services , 16 % in manufacturing , 14 % in retail trade , 13 % in arts , entertainment , recreation , accommodation , and food services , and smaller fractions in other sectors . The city 's biggest employers , Lock Haven University of Pennsylvania and Lock Haven Hospital , are among the seven biggest employers in Clinton County . 
 By 1900 , the lumber industry <a href='been_done' title='1'><mark>had</mark></a> declined , and the city <a href='null_genetive' title='2'><mark>'s</mark></a>economic base rested on other industries , including a furniture factory , a paper mill , a fire brick plant , and a silk mill . In 1938 , the Piper Aircraft Corporation , maker of the Piper Cub and other light aircraft , moved its production plant to Lock Haven . It remained one of the city <a href='null_genetive' title='3'><mark>'s</mark></a>biggest employers until the 1980s , when , after major flood damage and losses related to Hurricane Agnes in 1972 , it moved to Florida . The loss of Piper Aircraft contributed to an unemployment rate of more than 20 % in Lock Haven in the early 1980s , though the rate <a href='been_done' title='4'><mark>had</mark></a> declined to about 9 % by 2000 . Another large plant , the paper mill <a href='null_relcl' title='5'><mark>that</mark></a><a href='been_done' title='6'><mark>had</mark></a> operated since the 1880s in Castanea Township , closed in 2001 . By 2005 , 32 % of the city <a href='null_genetive' title='7'><mark>'s</mark></a>labor force was employed in health care , education , or social services , 16 % in manufacturing , 14 % in retail trade , 13 % in arts , entertainment , recreation , accommodation , and food services , and smaller fractions in other sectors . The city <a href='null_genetive' title='8'><mark>'s</mark></a>biggest employers , Lock Haven University of Pennsylvania and Lock Haven Hospital , are among the seven biggest employers in Clinton County . 
By 1900 , the lumber industry done declined , and da city  economic base rested on other industries , including a furniture factory , a paper mill , a fire brick plant , and a silk mill . In 1938 , the Piper Aircraft Corporation , maker of tdaPiper Cub and other light aircraft , moved its production plant to Lock Haven . It remained one of the city  biggest employers until the 1980s , when , after major flood damage and losses related to Hurricane Agnes in 1972 , it moved to Florida . Thdaoss of Piper Aircraft contributed to an unemployment rate of more than 20 % in Lock Haven in thedarly 1980s , though the dae done declined to about 9 % by 2000 . anotha large plant , the pdar mill done operated since the 18da in Castanea Township , closed in 2001 . By 2005 , 32 % of the citdalabor force was employed in health care , education , or social services , 16 % in manufacturing , 14 % in retail trade , 13 % in arts , entertainment , recreation , accommodation , and food services , and smaller fractions in other sectors . The city  biggest employers , Lock Haven University of Pennsylvania and Lock Haven Hospital , r among the sevedaiggest employers in Clinton County .