DCHP-1 Online
lumber slide 
n. Obs. an artificial sluiceway down which logs or cribs may be directed to avoid rapid, falls, or other obstructions in a river.
See also: slide (def. 1a).
- 1826 (1903) . . . the north side [of the river] is not available owing to the existence of our lumber slides.
- 1826 (1903) . . . the north side [of the river] is not available owing to the existence of our lumber slides.