I am not sure whether or not this is a botanical flower. I found it growing quite by itself (not appearing to have been planted) along the burke gilman with a number of other shrubs and sprawling plants. I thought it might be wood hyacinth, but that is a common name that didn't register with inaturalist, it could be wild hyacinth, I'm not sure of the difference between wild and wood and simple bluebells. The stems were about 25 cm tall.
If you think this observation is inaccurate, please add an ID, participate in the quality assessment above, or describe the inaccuracy in a comment.