D defs.my
Entry 1 sense Webster, 1913

Dalles

/(dălz)/ · IPA /dælz/
01 n. pl. A rapid, esp. one where the channel is narrowed between rock walls.
  1. 1.
    A rapid, esp. one where the channel is narrowed between rock walls.[Northwestern U. S. & Canada]
    “The place below, where the compressed river wound like a silver thread among the flat black rocks, was the far-famed Dalles of the Columbia.” — F. H. Balch.