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Zygadenus elegans
Grass like basal leaves, single stem with sheathed leaves halfway up and fused 6 petaled white flowers in a panicle.
Creek bank
It is endangered according to USDA
It is definitely Z. elegans, I looked it up to verify. Funny how such a pretty plant did not make it into any of my books, or any online resource I browsed. Thanks again for the help, I was sure it was in the Lily family but could not find it anywhere.
I believe it is a White Camas, also called Death Camas: the bulb is poisonous and the young leaves are deadly to grazing cattle. However, it also resembles False Hellebore [Veratrum Eschscholtzii]: also deadly poisonous.