Water fountains used to be spaced out every ten miles or so along the highway. Those old cars needed a lot of water! One of the old ones still exists at Ainsworth State Park, and I've got an old picture of a rather ornate one that used to be at Viento...
"A public convenience greatly appreciated where good water is available only at long intercals; this fountain is on the La Grande-Enterprise Highway in Wallowa County"
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Location: The Dalles, OregonContent: No. 46. Columbia River Highway, Ore.Photographer: B.C. Markham, The Dalles, Oregon