detail of wooden deck, wheel guard, walkway, , black steel girders on vertical king posts in 19th century forksville covered bridge survived major floods on march 1, 1865, , june 1, 1889, destroyed other bridges in west branch susquehanna river valley. between 1870 , 1890, logging in loyalsock creek watershed produced lumber rafts floated beneath bridge. these rafts, each containing 5,000–30,000 board feet (12–70 m) of lumber, carried down loyalsock mouth @ montoursville, , continued on west branch susquehanna river beyond. rafts ended when eastern hemlock clearcut. from 1908 1913, there stream gauge on bridge. twice day, creek height read on chain 21.88 feet (6.67 m) long on bridge s upstream side, , discharge measurements taken on downstream side. @ time served single span, wooden, covered highway bridge . bridge survived major flood on november 16, 1926, when dam broke upstream badly damaged ice jam on january 23, 1959, in flood left blocks of ice weighing 500 pounds (230 kg) in