 In order to move logs from the plateau above the Lower river , Adams River Lumber constructed several flumes . The flumes were elevated wooden troughs filled with water that floated logs down to the valley bottom . The largest of these was at Bear Creek . It incorporated trestles up to 25 metres ( 82 ft ) high and was capable of moving 3 @,@ 000 @,@ 000 metres ( 9 @,@ 800 @,@ 000 ft ) of logs per month . It was the largest flume in North America at its peak . The structures were dismantled after the areas became logged out . 
 In order to move logs from the plateau above the Lower river , Adams River Lumber constructed several flumes . The flumes <a href='uninflect' title='1'><mark>were</mark></a> elevated wooden troughs filled with water <a href='null_relcl' title='2'><mark>that</mark></a>floated <a href='uninflect' title='3'><mark>logs</mark></a> down to the valley bottom . The largest of these was at Bear Creek . It<a href='been_done' title='4'><mark></mark></a> incorporated trestles up to 25 metres ( 82 ft ) high and was capable of moving 3 @,@ 000 @,@ 000 metres ( 9 @,@ 800 @,@ 000 ft ) of logs per month . It was the largest flume in North America at its peak . The structures <a href='uninflect' title='5'><mark>were</mark></a> dismantled after the areas became logged out . 
In order to move logs from da plateau above the Lower river , Adams River Lumber constructed several flumes . The flumes was elevated wooden troughs filled w water floated log dwn to the valley bottom . The largest of these was at Bear Creek . It done incorporated trestles up to 25 metres ( 82 ft ) high and was capable of moving 3 @,@ 000 @,@ 000 metres ( 9 @,@ 800 @,@ 000 ft ) of logs per month . It was tdalargest flume in North America at its peak . The structures was dismantled after the areas became logged out .