Formed by the confluence of Blue Creek, Rocky Creek, Pigeon Creek and Bond Creek near Soda Springs, the river winds west-southwest through a narrow canyon.
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Other manifestations of the Yellowstone hotspot: Rexburg Volcanic Field (4.3 Ma), West of Rexburg, Idaho; Henry’s Lake Volcanism (1.3 Ma), Henry's Lake; Blackfoot Volcanic Field (3 Ma), Northwest of Soda Springs, Idaho; Gem Valley Volcanic Field (600 to 50 ka), near Grace, Idaho.
Working first for Conda Partnership from 1981 to 1985, Geddes spent the bulk of his career with Monsanto in Soda Springs as an environmental engineer from 1985 until 2011, taking a year-long leave of absence to serve on the Idaho State Tax Commission.
At Soda Springs was one branch of Lander Road (established and built with government contractors in 1858) which had gone west from near South Pass, over the Salt River Mountains and down Star Valley before turning west near present day Auburn, Wyoming and entering Idaho.