The route along the east rim of Tranquille Canyon has no trail and there are many hills and gullies to negotiate, but it is a scenic route with a number of geological features and open views to reward the explorer. This 8.25km route took a few hours but there was lots to see.
Tranquille Canyon was carved by water and when the glacial lake broke after the last Ice Age, a lot of water came all at once, eroding the lava flows and glacial deposits of the canyon slopes. Erosion continues to provide a number of interesting landforms in the canyon.
There is a sagebrush and grass benchland for much of the route, but the canyon becomes steeper and narrower about 3km north.
Beyond the colorful cliffs are the Guardsmen, a series of large hoodoos on both sides of the river in a narrow canyon (article on that route).
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