William Denison Lyman,
The Columbia River: Its History…
“ The first special object to fix our attention below the Cascades is Castle Rock. It is an isolated cliff of basalt, nine hundred feet high, covering about seventeen acres, its summit thinly clothed with stunted trees. It stands right on the verge of the River, nearly perpendicular on all sides, marvellous for symmetry from every point of view. At first sight one gets no conception of its magnitude, for it is dwarfed by the stupendous pinnacles, three thousand feet high, which compose the walls of the cañon. ”
