Holmstrom died in early 1946, on the second day of a surveying trip for the US Coast and Geodetic Survey on the Grande Ronde River, of a gunshot wound to the head.
The Grande Ronde River was given its name sometime before 1821 by French Canadian voyageurs working for the Montreal-based fur trading North West Company.
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Once the canal was complete, navigation was open on the Columbia from the mouth of the river all the way to Priest Rapids, and, up the Snake River, to the mouth of the Grande Ronde River near Rogersburg.
The Grande Ronde River flows through the valley; its tributaries include Catherine, Fir, Ladd, Little, Mill, Pyles, and Willow creeks.