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Highway construction did not start until later in this area, but while the CRH was under construction lower in the Gorge, the Celilo Canal was being built on this end...
CLICK HERE, or below, for a cool map showing the proposed location of the Celilo Canal. It is interesting how far away The Dalles was at that point in time, growing all the way out east to the current dam location...
"Boy Scout Troop 94, LaCrosse WA, circa 1952, Celilo Canal"
Dillon Crossing and the Locks are shown on this map
Source Uncertain